Answer:
positively charged (+2).
4th element on the periodic table
I don't know what else to say srry if I failed my mission :')
An atom with 4 protons and 2 electrons can be expressed as a cation with a charge of 2⁺ if it has lost electrons or as a neutral atom if it hasn't undergone any electron changes.
An ion is an atom or molecule that has gained or lost electrons, resulting in an electrical charge. In this case, you've provided an atom with 4 protons and 2 electrons. To express this as an ion, we need to determine whether it has gained or lost electrons and the resulting charge.
If the atom has lost electrons:
An atom loses electrons when it becomes positively charged (cation).
In this scenario, with 4 protons and 2 electrons, it has lost 2 electrons.
This results in a net positive charge of 2⁺. So, the ion is written as:
Ion: Cation with a charge of 2⁺
For example, this could be a helium atom (He) that has lost its 2 electrons, becoming He²⁺.
If the atom has gained electrons:
An atom gains electrons when it becomes negatively charged (anion).
In this case, with 4 protons and 2 electrons, it has not gained or lost any electrons, maintaining a neutral charge.
Ion: Neutral Atom
So, depending on whether the atom gained or lost electrons, it can either be a cation with a charge of 2⁺ (if it lost electrons) or simply a neutral atom (if it maintained its original electron count).
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100 Points!! PLEASE HELP!! PLEASE!! PLEASE!!
The Universe is believed to have been formed from a very dense fireball _____________ of years ago. As the fireball
expanded and cooled stars and galaxies formed. The fireball explosion is often called the ___ ________. The explosion
threw all the material outwards; that is why scientists believe the universe is getting bigger or ____________. Scientists
have confirmed that the Universe is expanding by examining the light given off by stars. Astronomers now know that the
distance to the furthest galaxies is becoming greater as these galaxies are moving away the __________. Stars are
produced from gas clouds or ___________, which contain mainly the element ____________. The type of star produced
depends on the mass of the star. Red _________ are stars formed which have a mass _________ than that of our
____________ .
Hydrogen is the __________ of all stars. During nuclear fusion the hydrogen molecules combine producing
____________, releasing lots of ____________ in the process. How quickly the hydrogen is used up depends on the size
of the star. Massive stars burn hydrogen very quickly. Additional nuclear fusion reactions can convert helium into
elements with larger atoms, for example lithium. However the elements with the largest atoms only form when a star
explodes as a _______________
The amount of energy given out by a star, its luminosity, varies considerably. ____________ dwarfs are stars that have a
very low luminosity, about one hundredth of the Sun. Super giant stars which are very large red giant stars, can give out
as much energy as 1,000,000 Suns. Some scientists believe that our Solar System was once a binary star system. The Sun
was the __________ of the two stars and burnt its fuel slowly, lasting millions of years. The larger star used up all its fuel
and destroyed itself in a supernova explosion, leaving the Sun behind.
The Sun is a very stable star. In a few billion years from now the Sun will use up its fuel supply and start to change. It will
probably expand and form a red giant. Finally, it may form a white dwarf or a ____________ star. When this happens
there will no longer be life on the Earth, but by then we should have found new _________ around other stars.
Your answer choices are fuel, nebula, expanding, less, hydrogen, smaller, energy, Sun, quickest, supernova, homes, white, neutron, giants,
helium, Big Bang, billions
Answer:
(13) billions
Big bang
expanding
quickest
nebula
hydrogen
giants
less,sun
fuel
helium
energy
supernova
white
smaller
neutron
planets/homes
In which of the following substances does a beam of light travel the fastest?
A. water
B. plastic
C. glass
D. air
Answer:
d
Explanation:
The light is an electromagnetic radiation which can be perceived by our human eye. The beam of light travel fastest in air. The correct option is D.
What is light?The light is defined as an electromagnetic radiation which help us to see the objects. It is composed of small packets of energy called photons. The light always moves in a straight line. Light travels at a faster rate than sound waves.
The speed of light is found to be 3 × 10⁸ m/s. Light does not require a physical medium for the propagation. It is known as a transverse wave which travels without the use of medium.
According to Einstein's theory of relativity, nothing can travel faster than light. When light is incident on any surface, the particles of light collide with the surface and thereby reflection and refractions occur.
Thus the correct option is D.
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Carbon dioxide and water are produced when pentane (C5H12) reacts with oxygen. What are the coefficients for this reaction?
Answer:
C5H12 + 8O2 —> 5CO2 + 6H2O
The coefficients are 1, 8, 5,6
Explanation:
The equation for the reaction is given below:
C5H12 + O2 —> CO2 + H2O
Now let us balance the equation. This is illustrated below:
There are 5 atoms of C on the left side and 1atom on the right side. It can be balance by putting 5 in front of CO2 as illustrated below:
C5H12 + O2 —> 5CO2 + H2O
There are 12 atoms of H on the left side and 2atoms on the right. It can be balance by putting 6 in front of H2O as illustrated below:
C5H12 + O2 —> 5CO2 + 6H2O
There are a total of 16 atoms of O on the right side and 2atoms on the left side. It will be balance by putting 8 in front of O2 as illustrated below:
C5H12 + 8O2 —> 5CO2 + 6H2O
Now we see clearly that the equation is balanced as the number of atoms of the different elements on both sides of the equation are the same.
The coefficients are 1, 8, 5,6
Why do reactivity increases on moving from top to bottom in group 2 of modern periodic table?
Answer:
that's because....
group 1 (e.g Na, K) those tend to lose one electron to gain noble gas electron configuration.
they can achieve that by just losing one electron from their outer shell.
as you go down the group 1, element gets bigger in size, which means there is more space between nucleus (which is in center of atom) and electron of outer shell. the more far away they are the less attraction force between them.
so its easier for potassuim to lose one electron than for lithuim.
so that means potassium will easily give up 1 electron to react with non metal or other element therefore it is more reactive than lithuim
but in case of non metal, the opposite happens but simple to understand.
as you go down the group 7 (halogen- Cl, Br, I) element will get bigger therefore force between nucleus and outer electron is getting smaller. they have to gain 1 electron in order to fill the outer shell (to gain noble gas electron configuration.)
as florine is more smaller in size than clorine it is more reactive because florine has more tendency to pull extra electron from metal or other element towards its side. so it easily gain 1 electron to react.
1) ____ NaCl + ____ KOH ____ NaOH + ____ KCl
2) ____ MgO + ____ Li2SO4 ____ MgSO4 + ____ Li2O
3) ____ H2O ____ H2 + ____ O2
4) ____ RbF + ____ Be(NO3)2 ____ RbNO3 + ____ BeF2
5) ____ Ag +____ Cu(NO3)2 ____ AgNO3 + ____ Cu
6) ____ CO2 + ____ Cl2 ____ CCl4 + ____ O2
7) ____ CuSO4 + ____ HCN ____ Cu(CN)2 + ____ H2SO4
8) ____ Ga2O3 + ____ Li ____ Li2O + ____ Ga
9) ____ BaF2 + ____ Na2S ____ BaS2 + ____ NaF
10) ____ NH3 ____ N2 + ____ H2
please solve as many as you can, the boxes are arrows
Answer:
hope it's helpful to you .
your 9th question is wrong but I did it correctly
it's not BaS2 it's BaS
The student's inquiry involved balancing a series of chemical equations, a fundamental concept in stoichiometry. Each balanced equation ensures that there is the same number of each element's atoms on the reactant side as on the product side, in accordance with the law of conservation of matter.
Explanation:The questions you've posed involve stoichiometry, a field in chemistry that quantifies the relationships of different substances in a chemical reaction. Balancing chemical equations involves ensuring the conservation of atoms (each element in reactants should be equal to the count of the same element in products). Here are the balanced equations:
2 NaCl + 2 KOH → 2 NaOH + K2Cl2MgO + Li2SO4 → MgSO4 + 2Li2O2 H2O → 2 H2 + O22 RbF + Be(NO3)2 → 2 RbNO3 + BeF22 Ag + Cu(NO3)2 → 2 AgNO3 + CuNo reaction occurs in this case.3 CuSO4 + 6 HCN → 3 Cu(CN)2 + 3 H2SO46 Li + Ga2O3 → 3 Li2O + 2 Ga2 Na2S + BaF2 → BaS + 4 NaF2 NH3 → N2 + 3 H2Learn more about Balancing chemical equations here:
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How many moles do you need in HCL
The chemical equation below shows the reaction of glucose and oxygen.
C6H12O6 + 6O2 -> 6CO2 + 6H2O + 36ATP
Which process does this equation represent and two of its products would be the reactants to which process?
⦁ Photosynthesis, aerobic respiration
⦁ Aerobic respiration, photosynthesis
⦁ Anaerobic respiration, photosynthesis
⦁ Nitrogen fixation, aerobic respiration
When turbidity currents deposit graded beds of mud and sand on the ocean floor, what type of rock is formed?
A. Sedimentary
B. Metamorphic
C. Igneous basalt
D. Igneous granite
What mass of K2SO4 What do you need to prepare 1200 g of an 8% K2SO4 m/m solution
Answer:
96 grams are required.
Explanation:
Given data:
Mass of K₂SO₄ required = ?
Mass of K₂SO₄ from = 1200 g of 8%
Solution:
Formula:
m/m% = mass required / mass given
Now we will put the values:
8%= x / 1200 g
8/100 = x / 1200 g
0.08 = x / 1200 g
0.08 × 1200 g= x
x = 96 g
So 96 gram of 1200 g is required.
the electrical current in a circuit is measured in which of the following units.
volts
resistance
amperes
pressure
The electrical current in a circuit is measured in amperes (amps). According to Ohm's Law, current (I) equals voltage (V) divided by resistance (R). Understanding these units helps grasp the flow of electricity in circuits.
The electrical current in a circuit is measured in amperes (often abbreviated as amps and symbolized by 'A'). According to Ohm's Law, the electric current (I) can be calculated by dividing the voltage (V) by the resistance (R). These relationships and units help in understanding the flow of electric current in circuits:
Voltage (V) is measured in volts.Resistance (R) is measured in ohms.Electric current (I) is measured in amperes.Solve the problems. Express your answers to the correct number of significant figures. 2.31/0.790
Answer:
[tex]\dfrac{2.31}{0.790}=2.92[/tex]
Explanation:
When you divide two measures, the rule for the number of significant figures of the quotient is to keep the number of significant figures of the measure with least significant figures.
2.31 has three significant figures0.790 has three significant figuresThen, the asnwer must have three significant figures:
[tex]\dfrac{2.31}{0.790}\approx 2.92405\approx2.92[/tex]
Since the figure after 2.92 is less than five, you just drop it.
Final answer:
To solve 2.31 ÷ 0.790, divide the numbers and round the result to three significant figures, the least number present in the given values, giving the final answer as 2.92.
Explanation:
To solve the division problem 2.31 ÷ 0.790 with the proper number of significant figures, we must consider the number of significant figures in each of the original numbers. The number 2.31 has three significant figures, and 0.790 has three significant figures as well. When dividing, the number of significant figures in the result should be the same as the number with the least significant figures in the problem.
To get the answer, we divide 2.31 by 0.790:
Perform the division using a calculator: 2.31 ÷ 0.790 = 2.92405063…Round the result to three significant figures because that is the least number of significant figures in the original numbers: 2.92Therefore, the answer to the problem expressed to the correct number of significant figures and with proper units (if they were provided in the original problem), would be 2.92.
What information does a net ionic equation give?
O
A. It lists only the spectator ions that are present.
B. It lists only the components that are ions.
O
C. It lists only the substances that are changed.
D. It lists only the aqueous components of the reaction.
Answer:
C. It lists only the substances that are changed.
Explanation:
Balanced Chemical equation:
HClO₂(aq) + NaOH(aq) → H₂O(l) + NaClO₂ (aq)
Ionic equation:
H⁺(aq) + ClO₂⁻(aq) + Na⁺(aq) + OH⁻(aq) → H₂O(l) + Na⁺(aq) + ClO₂⁻ (aq)
Net ionic equation:
H⁺(aq) + OH⁻(aq) → H₂O(l)
The ClO₂⁻(aq) and Na⁺ (aq) are spectator ions that's why these are not written in net ionic equation. The water can not be splitted into ions because it is present in liquid form. This'e why it is written in net ionic equation.
Spectator ions:
These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.
Final answer:
A net ionic equation lists only the substances that change during a reaction, excluding spectator ions that do not participate in the chemical process. Therefore, the correct answer is C: It lists only the substances that are changed.
Explanation:
A net ionic equation is a chemical equation that shows only the species that actually participate in the reaction. These species are the ions that undergo a chemical or physical change during the reaction, which is different from the spectator ions that do not participate in the reaction. Spectator ions are present in the solution before and after the chemical reaction and do not undergo any change, so they are not included in the net ionic equation.
Correctly answering the student's question, a net ionic equation provides information about option C: It lists only the substances that are changed. This type of equation demonstrates the actual chemical change between the ionic compounds, excluding all the spectator ions that remain unchanged during the reaction process.
List one way you can conserve water
Answer:
Shorter showers
Explanation:
A 5 to 10 minute shower will only take about 10 or 20 gallons of water. Or you could take a bath and not fill the bathtub up very much.
It's completely up to you which one you chose to use. Many people take 30 to 60 minute showers. Based on that math, that could take up to 120 gallons of water.
That shows that simply shortening your shower time, you will save gallons of water!
~CaityConcerto
Is breaking a pretzel physical change or chemical change
Propane burns in oxygen to produce carbon dioxide and steam. Which of the chemical equations matches the reaction above?
A. C3H8 + 5O2 3CO2 + 4H2O
B. C3H8 + 4O2 2CO2 + 4H2O
C. C3H8 + 6O2 2CO2 + 8H2O
D. C3H8 + 6O2 3CO2 + 6H2O
Answer: A
Explanation:
Balancing a chemical reaction, we must take into consideration every element both at the reactant and products side.
Since we were told propane reacts with oxygen to produce steam and carbon dioxide, we already have an idea of how the equation would be just remaining balancing the stoichiometry of the equation.
C3H8 + 5O2 =====》 3CO2 + 4H20
From the equation above,
3 atoms of carbon is present at reactant side and 3 carbon is also at the product side.
8 Hydrogen at reactant = 4 * 2 Hydrogen at product.
10 Oxygen at reactant = 3*2 + 4 oxygen at product
The equation must be balanced because law of conservation of matter must take place in every chemical reaction, matter can neither be created nor destroyed but can change form.
Answer:
A
Explanation:
Propane burns in oxygen to produce carbon dioxide and steam. The chemical equation is written with chemical symbols below:
C3H8 + O2 CO2 + H2O
There are three carbon atoms on the left side, but only one on the right, so we need to put a 3 in front of the carbon dioxide molecule to give three carbons on each side:
C3H8 + O2 3CO2 + H2O
There are eight hydrogen atoms on the left side and two on the right side, so we need to place a 4 in front of the water molecules on the right side:
C3H8 + O2 3CO2 + 4H2O
There are 2 oxygen atoms on the left side and 10 on the right side, so we need to place a 5 in front of the oxygen molecule on the left side:
C3H8 + 5O2 3CO2 + 4H2O
The equation has been balanced.
This help with this chart
Answer:
Explanation:
Atomic mass is the sum of number of protons and neutrons while atomic number is the number of protons or electrons.
A neutral atom has equal number of protons and electrons that's why atomic number could be either number of protons or electrons.
Element Symbol Atomic# Mass# Protons Neutrons
Mercury Hg 80 200 80 120
Solution:
number of neutrons = mass number - atomic number
number of neutrons = 200 - 80
number of neutrons = 120
Element Symbol Atomic# Mass# Protons Neutrons
Tungsten W 74 184 74 110
Solution:
number of neutrons = mass number - atomic number
number of neutrons = 184 - 74
number of neutrons = 110
Element Symbol Atomic# Mass# Protons Neutrons
Sodium Na 11 23 11 12
Solution:
number of neutrons = mass number - atomic number
number of neutrons = 23 - 11
number of neutrons = 12
Element Symbol Atomic# Mass# Protons Neutrons
Antimony Sb 51 122 51 71
Solution:
number of neutrons = mass number - atomic number
number of neutrons = 122 - 51
number of neutrons = 71
Element Symbol Atomic# Mass# Protons Neutrons
Silver Ag 47 108 47 61
Solution:
number of neutrons = mass number - atomic number
number of neutrons = 108 - 47
number of neutrons = 61
I'M BEGGING Plzzzzzzz
2 Al + 3 FeO → Al2O3 + 3 Fe
If 379.48 grams of Al2O3 are produced, how many grams of Fe will also be produced?
Answer:
Fe=625.026g
Molar mass of Al2O3=102g
Molar mass of Fe=168g
102g of Al2O3-168g of Fe
379.48g of Al2O3-xg of Fe
Cross multiply
102x = 168×379.49
102x=63752.64
X= 625.026g
Therefore,the mass of Fe is 625.027g
Explanation:
• What policies might people put in place to conserve water levels in lakes and aquifers?
Some policies they might do is to put limits on water usage, like making sure that people don't use too much water in baths and when they are tending to their gardens.
Reduce the use of water can conserve water levels.
Following are the policies that might people put in place to conserve water levels in lakes and aquifers:Dispose of chemicals properly in order to protect the water from contamination.Take used motor oil to a recycling center.Use modern methods of irrigation for irrigating the crops.Take short showers during bathing.Shut water off while brushing teeth.In conclusion, reduce the use of water can conserve water levels.
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What charge will an ion of phosphorus form?
Answer:
A charge of -3
Explanation:
If you look on a periodic table you will find that phosphorus is 3 elements away from the nearest noble gas argon. This means that phosphorus would prefer a charge of -3!
Answer:typically it will be -3
Explanation:
It prefers to take up 3 electrons and thereby become phosphide with a -3 charge. since it is a nonmetal it will take up electrons making it negative as an ion. In order to fill up its last shell, to become stable, to form an octet it will need 3 added electrons which will give it that -3 charge. An atom of phophorus will be neutral, An ion of phsphorus will have a -3 charge.
You may remember that fresh water is the only type of water humans and animals can drink. For this reason, it is essential to life. What percentage of all water on Earth is fresh? options: 25% 75% 3% 90%.....
Answer:
3%
Explanation:
We have heard about the clean water crisis, but how can that happen if earth mostly covered in water? Even though 70% of the earth is covered in water, most of those water is at ocean and has a high concentration of salt. We can't drink those water because the salt will take more water from our bodies. Freshwater only makes up about 2.5-3% water bodies while the ocean makes up 97% of the rest. Out of 3% freshwater, we have, only 1% of them that easily accessible.
Hydrogen gas reacts with oxygen to form liquid water. Write a balanced chemical equation for this reaction
Answer:
2H2 + O2 —> 2H2O
Explanation:
The equation for the reaction between H2 and O2 to produce liquid water is illustrated below:
H2 + O2 —> H2O
Next, we need to balance the equation. This can be achieved by doing the following:
There are 2 atoms of oxygen on the left side and 1 atom on the right side. It can be balanced by putting 2 in front of H2O as shown below:
H2 + O2 —> 2H2O
There are a total of 4 atoms of Hydrogen on the right side and 2 atoms on the left. It can be balanced by putting 2 in front of H2 as shown below:
2H2 + O2 —> 2H2O
Now we can see that the equation is balanced as we have the same number of atoms of Hydrogen and oxygen on both sides of the equation
The balanced chemical equation for the reaction of hydrogen gas with oxygen to form liquid water is: 2H2 + O2 = 2H2O. This equation respects the law of conservation of mass.
Explanation:The reaction of hydrogen gas with oxygen to form liquid water is a chemical reaction that can be written as a balanced chemical equation. In this reaction, two molecules of hydrogen gas (H2) react with one molecule of oxygen gas (O2) to form two molecules of liquid water (H2O). So, the balanced chemical equation for this reaction is:
2H2 + O2 = 2H2O
This equation shows that for every two molecules of hydrogen gas and one molecule of oxygen gas, two molecules of water are produced. It is balanced because it obeys the law of conservation of mass, which states that the total mass of the reactants equals the total mass of the products in a chemical reaction.
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If 1.30 grams of a protein (non -electrolyte) are added to a 100.0 mL of water, the osmotic pressure of the resulting solution is 0.0074 atm at 298 K. What is the molar mass of the protein ?
Answer:
M = 0.43× 10⁵ g/mol
Explanation:
Given data:
Mass of protein = 1.30 g
Volume of water = 100.0 mL ( 100/1000 =0.1 L)
Pressure of solution = 0.0074 atm
Temperature = 298 K
Molar mass of protein = ?
Solution:
Formula:
PV = nRT
n = PV / RT
n = 0.0074 atm ×0.1 L / 0.0821 atm. L / mol.K × 298 K
n = 0.00074 / 24.5 /mol
n = 3.0 × 10⁻⁵ mol
Molar mass of protein:
Number of moles = mass / molar mass
3.0 × 10⁻⁵ mol = 1.30 g/ M
M = 1.30 g/ 3.0 × 10⁻⁵ mol
M = 0.43× 10⁵ g/mol
Which of the statements is correct regarding catalysts ( click 4 that apply )
Catalyst increase the rate of reaction
Catalyst decrease the rate of reaction
Catalyst increase the activation energy needed to start a reaction
Catalyst decrease the activation energy needed to start a reaction
They are used up in the reaction
They are not used up in the reaction
Catalyst are very specific
Catalyst are not very specific
Catalyst increase the rate of reaction
Catalyst decrease the activation energy needed to start a reaction
They are not used up in the reaction
Catalyst are not very specific
Explanation:
From the basic chemistry it is known Catalysts are substance that accelerates the rate of reaction without altering the nature of reaction.
Catalysts decreases the energy required for activation, in order to make collisions quicker.
Then, Catalyst just alters the rate of reaction alone and doesn't takes part in the chemical reaction.
Some catalysts are specific. But in general most of the catalysts are not specific in nature.
2. When a teaspoonful of sugar is added to water in a beaker,
the sugar dissolves. The resulting mixture is
1) a compound
2) a solution
3) a suspension
4) an emulsion
The mixture is a solution
Its a solution because two substances mixed
The sea water has 8.0x10^-1 cg of element strontium. Assuming that all strontium could be recovered, how many grams of strontium could be obtained from 9.84x10^8 cubic meter of seawater. Assuming the density of sea water is 1.0g/mL.
Answer:
[tex]\large\boxed{\large\boxed{7.9\times 10^9g}}[/tex]
Explanation:
The information of the content of the element strontium in seawater is incomplete. The complete information is:
The seawater has 8.0×10⁻¹cg of element strontium per kilogram of seawater. Solution1. First, convert the given volume of seawater given to kilograms
[tex]9.84\times 10^{8} m^3\times \dfrac{1,000dm^3}{m^3}\times \dfrac{1,000cm^3}{dm^3}\times 1.0\dfrac{g}{cm^3}\times\dfrac{1kg}{1,000g}=9.84\times 10^{11}kg[/tex]
2. Second, multiply the given concentration of the element strontium by the amount of seawater in kilograms
[tex]8.0\times 10^-1cg/kg\times 9.84\times 10^{11}kg\times 1g/100cg=7.872\times 10^9g[/tex]
3. Finally, round to two significant figures:
[tex]7.9\times 10^9g[/tex]
determine the relationship between wavelength and frequency
Answer:
Explanation:
Wavelength and frequency are related by the velocity equation of waves.
Velocity = f x ∧
where f is the frequency
∧ is the wavelength
Frequency of a wave is the amount of that wave that passes through a point at a particular time.
Wavelength of a wave is the distance between two successive crests and trough.
Velocity of a wave is the speed of a wave
Describe the difference between Al3+
and N3-
Which of th following is true for a parallel circuit
Answer:
B. The voltage is the same across all resistors in the circuit.Explanation:
The answer choices are:
A.The current is the same across all resistors in the circuit.B.The voltage is the same across all resistors in the circuit.C. As more resistors are added, the current will decrease.D. The sum of the voltage drops will equal the total voltage. SolutionIn a simple parallel circuit, each component (resistor) is connected directly to the battery forming different branches or pathways to the current.
Thus, the ends of each resistor receives the total potential difference or voltage from the battery, which is what the statement B. asserts. Hence, statement B is true.
On the other hand, the current will split among the different pathways, following Ohm's law: the greater the resistance of the resistor the lower the current. Thus, the statement A is false.
For a parallel circuit, the total resistance decreases as more resistors are added, which means that, again following Ohm's law, the current will increase, contradicting the statement C. Thus, the statement C is false.
It is in the series circuit that 'the sum of the voltage drops will equal the total voltage"; in a parallel circuit the voltage drop is the just one and the same for each resistor. Thus, the statement D is false,too.
2Al + 3H2SO4->Al2(SO4)3+H2
a) how many grams of aluminum sulfate would be formed if 250g h2SO4 completely reacted with aluminum
287.39 grams of Al2(SO4)3 is formed if 250g H2SO4 completely reacted with aluminum.
Explanation:
Balanced chemical equation:
2Al + 3H2SO4->Al2(SO4)3+H2
Data given:
atomic mass of Al2(SO4)3 = 342.14 gram/mole
mass of H2SO4 given = 250 gram
atomic mass of one mole of H2SO4 = 98.079 grams/mole
number of moles = [tex]\frac{mass}{atomic mass of one mole}[/tex]
number of moles = [tex]\frac{250}{98.079}[/tex]
number of moles = 2.54 moles
from the equation it can be seen as
3 moles of H2SO4 will react to give 1 mole Al2(SO4)3
2.54 moles of H2SO4 will react to give x moles of Al2(SO4)3.
[tex]\frac{1}{3}[/tex]= [tex]\frac{x}{2.54}[/tex]
x = 0.84 moles of Al2(SO4)3 is formed.
to calculate mass of the Al2(SO4)3 = Number of moles x atomic weight of one mole
= 0.84 x 342.14
= 287.39 grams of Al2(SO4)3 is formed.
How much mercury and oxygen could be obtained from 21.7g of mercury (II) oxide
20.06 g of Hg and 1.6 g of O₂
Explanation:
To Find:
Number of Mercury and oxygen that can be obtained from 21.7 g of HgO
First we have to write the balanced equation for the decomposition reaction of Mercury(II) oxide as,
2 HgO (s) → 2Hg(l) + O₂ (g)
21.7 g of HgO = [tex]\frac{21.7 g}{216.59 g / mol}[/tex]
= 0.1 mol of HgO.
As per the above equation, we can find the mole ratio between HgO and Hg is 1: 1 and that of HgO and oxygen is 2:1 .
So amount of Hg produced = 0.1 mol × 200.59 g / mol ( molar mass of Hg)
= 20.06 g of Hg
Amount of oxygen produced = 0.05 mol × 32 g/ mol = 1.6 g of O₂
Thus it is clear that 20.06 g of Hg and 1.6 g of O₂ is obtained from 21.7 g of HgO
Final answer:
From 21.7g of mercury (II) oxide, approximately 20.059 g of mercury and 1.6 g of oxygen can be produced through the decomposition reaction. This calculation uses the stoichiometry of the reaction and the molar masses of the substances involved.
Explanation:
To determine how much mercury and oxygen could be obtained from 21.7g of mercury (II) oxide, we need to consider the decomposition reaction of mercury (II) oxide under standard state conditions:
2HgO(s, red) → 2Hg(l) + O2(g)
By using the molar mass of mercury (II) oxide (216.59 g/mol), we can convert the mass of mercury (II) oxide to moles:
21.7 g HgO × (1 mol HgO / 216.59 g HgO) = 0.1 mol HgO
Following the stoichiometry of the reaction, 0.1 moles of HgO will produce 0.1 moles of Hg and 0.05 moles of O2, since 2 moles of HgO decompose to produce 1 mole of O2. We can then calculate the mass of mercury and oxygen produced:
0.1 mol Hg x (200.59 g Hg/mol) = 20.059 g of Hg
0.05 mol O2 x (32 g O2/mol) = 1.6 g of O2
Therefore, 21.7g of mercury (II) oxide will produce approximately 20.059 g of mercury and 1.6 g of oxygen.