Answer:
Explanation:
The given pH = 8.55
Unknown:
[H₃O⁺] = ?
[OH⁻] = ?
In order to find these unknowns we must first establish some relationship.
pH = -log[H₃O⁺]
8.55 = -log[H₃O⁺]
[H₃O⁺] = inverse log₁₀(-8.55) = 2.82 x 10⁻⁹moldm⁻³
To find the [OH⁻],
pH + pOH = 14
pOH = 14 - pH = 14 - 8.55
pOH = 5.45
pOH = -log[OH⁻]
[OH⁻] = inverse log₁₀ (-5.45) = 3.55 x 10⁻⁶moldm⁻³
The solution is basic because it has more concentration of OH⁻ ions compared to H⁺ ions.
What is generally true about the particles in a gas?
Explanation:
Every gas molecules are held by weak Vander waal forces because of which each molecule of a gas is free is move from one place to another.
This causes more number of collisions between molecules of a gas and gaps will also increase between each molecule.
As a result, gases are able to diffuse or spread at a faster rate.
Hence, generally it is true about the particles in a gas that gases diffuse at a faster rate.
which of the following shapes would represent a molecule with two bonded atoms and 3 lone pairs on only one of them , trigonal planar , Bent , Trigonal pyramidal , linear
Answer:
The correct answer is D :Linear
Explanation:
Talking about molecular geometry and arrangement of atoms, liner geometry and trigonal bipyramidal arrangement of atoms would have 3 lone pairs and 2 no. of bond pairs.
For example, in ICl2 and XeF2, the central molecule has 3 lone pairs, and it shows sp3d hybridization.
In trigonal bipyramidal arrangement, orbitals have trigonal bipyramidal structure. It has three-atom molecules which have a linear shape and the orbitals on the equator contain three lone pairs each.
Answer:
linear
Explanation:
a p e x
What does the symbol "E3" represent?
A the energy required to remove the third valence electron
B the energy of electrons in the third energy level
C the energy required to remove an electron in the third energy level
D the energy required to remove three of the outermost electrons
Answer:
your answer to your question is B
I think answer of this question is D
What is the molarity of a solution prepared by diluting 250 mL of a 40% H2SO4 solution to 1 Liter? The density of the stock solution is 1.17 g/mL
To calculate the molarity of the diluted H₂SO₄ solution, first find the mass of H₂SO₄ in the initial solution. Convert this mass to moles and divide by the final volume in liters. The resulting molarity is 1.194 M.
To find the molarity of the diluted sulfuric acid solution, follow these steps:
Calculate the mass of H₂SO₄ in the initial solution:
A 40% H₂SO₄ solution means there are 40 grams of H₂SO₄ in every 100 grams of solution. The density of the stock solution is 1.17 g/mL, so 250 mL of stock solution weighs :
250 mL × 1.17 g/mL = 292.5 g.
Mass of H₂SO₄: 40% of 292.5 g = 0.40 × 292.5 g = 117 g H2SO4.
Calculate the moles of H₂SO₄:
Molecular weight of H₂SO₄ (H: 1 g/mol, S: 32 g/mol, O: 16 g/mol) = 2(1) + 32 + 4(16) = 2 + 32 + 64 = 98 g/mol.
Moles of H₂SO₄
= 117 g ÷ 98 g/mol
= 1.194 moles of H₂SO₄.
Determine the volume of the final solution in liters:
The final volume is given as 1 liter.
Calculate the molarity:
Molarity (M)
= moles of solute ÷ liters of solution
= 1.194 moles ÷ 1 liter
= 1.194 M.
Therefore, the molarity of the diluted H₂SO₄ solution is 1.194 M.
stage in which a typical star has completely stopped fusion
Answer:
Red Giant
Explanation:
The stage in which a typical star has completely stopped fusion is called the Red Giant.
Please mark brainliest and have a great day!
Final answer:
A star stops fusion at the end of its lifecycle, becoming a white dwarf. Fusion of iron in the core requires energy, leading to the star's demise. Eventually, the white dwarf may explode as a type Ia supernova.
Explanation:
The stage in which a typical star has completely stopped nuclear fusion marks the end of its life cycle. After a star consumes all its hydrogen and goes through subsequent stages fusing heavier elements, it eventually reaches a point where further fusion is not energetically favorable. For example, the fusion of iron actually requires energy, signaling a catastrophic end for any star that reaches this stage.
A typical example of such an end state is when a star becomes a white dwarf. This occurs when all nuclear fusion has ceased within the star's interior, and it's stabilized by degeneracy pressure. The white dwarf represents the cooling cinder of a once vibrant star. Despite a brief resurgence of fusion in its outer layers that consume any remaining hydrogen, the star has effectively 'died' in terms of its stellar lifecycle. Over time, it may succumb to a violent end and be destroyed by a type Ia supernova, especially if it accumulates additional material from a companion star.
which are causes of mechanical weathering? check all that apply.
1 acid rain
2 plant growth
3 animal actions
4 carbon dioxide
5 pressure release
hii mate
YOUR ANSWER IS 5.PRESSURE RELEASE IS CAUSE OF MECHANICAL WEATHERING
Answer:
The answer is plant growth, animal actions, and pressure release.
Explanation:
I’m my lecture, it gave me a list of mechanical and weathering stuff so, you know it is right. :) hope this helped
Which diagram represents an object at static equilibrium?
A.
A
B.
B
C.
C
D.
D
Who knows the real answer to this??? Is it really D?
Answer:
the answer would be B.20n-->X<--20n
Explanation:
the amount of force is equal and balances out each other forming an equilibrium
Do you guys know the answer
Answer:
NH₄NO₃.
Explanation:
NH₄NO₃ is a salt that has a pH < 7.It is formed from the reaction of strong acid (HNO₃) and weak base (NH₄OH).HNO₃ + NH₄OH → NH₄NO₃ + H₂O.
It is clear that it is an acidic salt.
So, its pH is < 7.
The Cretaceous-Tertiary extinction, the most famous of all the Big Five, has been attributed to what major event that triggered the fall of the dinosaurs?
Answer:
meteorite or comet impact
Explanation:
The Cretaceous-Tertiary extinction is not the most devastating one that happened, but because of the organisms that got extinct are very well known and famous, it too became the most famous extinction. The reason for the extinction was an impact of a meteorite or comet where Yucatan is located in the present. The impact was so strong that the energy released from it wiped out everything in the surrounding area. But that was not all, as this impact also caused large scale wildfires, activated most of the volcanoes on the planet, triggered enormous tsunami, and a very hot air mass circled the whole planet and fried everything that was not sheltered. The dust, ashes, and other particles released into the atmosphere blocked the sun for a long period of time. the end result was the extinction of lot of animals and plants, most noticeably the dinosaurs.
The most common form of matter in the universe
Answer:
Plasma
Explanation:
At the current rate, a graph of carbon dioxide produced by fossil fuels over time would __________.
slope upward
slope downward
be horizontal
be vertical
Answer:
Slope upward
Explanation:
The amount of carbon dioxide increases daily due to the increased use of petroleum fuels in diesel engines in the industries and by motor car users. The number of petroleum cars increases as their affordability increases. Use of LPG as domestic fuel has increased. These practices increase the amount of carbon dioxide in the atmosphere.
The rate of CO₂ production increases as these activities increases daily.
what is the solution to the problem expressed to the correct number of significant firgures? 15.11+(142×16.5)
A 2,358
B 2,358.1
C 2,360
D 2,400
Answer:
B. 2358.1
Explanation:
142×16.5=2343
ans+15.11=2358.2
Answer: A. 2,358
Look at the image below.
This is a significant figures calculator.
What is an example of dissociation?
table sugar dissolving in water
table salt dissolving in water
hydrogen chloride dissolving in water
vegetable oil dissolving in water
Answer:
Table salt dissolving in water
Explanation:
NaCl(s) ⟶ Na⁺(aq) + Cl⁻(aq)
Sodium chloride is an ionic solid. When it goes into solution, the ions separate from the surface of the solid. The process is called dissociation.
A is wrong. In the solution process, the molecules simply separate from the surface of the crystal.
C is wrong. When HCl dissolves in water, it forms hydronium and chloride ions. The dissolution of covalent compounds in water to produce ions is called ionization.
D is wrong. Vegetable oil does not dissolve in water.
Which statement is true according to the kinetic theory?
A.
Molecules of different gases with the same mass and temperature always have the same average density.
B.
Molecules of different gases with the same mass and temperature always have the same average volume.
C.
Molecules of different gases with the same mass and temperature always have the same pressure.
D.
Molecules of different gases with the same mass and temperature always have the same molecular mass.
E.
Molecules of different gases with the same mass and temperature always have the same average kinetic energy.
Answer:
I want to say B but I'm not sure
Answer:
The statement E is true on average kinetic energy; and mass and temperature. If gases from different types have same quantity of mass and same quantity of temperature then there will be same quantity in average kinetic energy.
Explanation:
The gaseous kinetic theory has the assumption that the size of molecules in any compound is very small compared to the distance between them. Also, the molecules are always in a vibration and it collides with boundary of cylinder and with each other.
In reference to the kinetic theory of gases, the different gases having different mass at same temperature always have the same quantity of average kinetic energy because the average kinetic energy of gases has directly proportional relation to the gaseous temperature.
The gas at higher temperature has higher kinetic energy amount and vice-versa.
carbon dioxide is a common gas produced in burning describe a test for carbon dioxide gas
Answer:
burning gasoline
Explanation:
The test for carbon dioxide involves passing the gas through lime water. If the lime water turns milky, this indicates the presence of carbon dioxide. If more CO2 is passed through the milky lime water, it becomes clear again.
Explanation:You can test for the presence of carbon dioxide using a simple chemical reaction involving lime water (calcium hydroxide solution). This test is based on the fact that when carbon dioxide gas is passed into lime water, the lime water turns milky. This is because carbon dioxide reacts with the calcium hydroxide to produce calcium carbonate, which is insoluble in water and appears as a white precipitate, causing the milky appearance.
Step-by-step explanation of the test:
Prepare lime water by shaking about 1 gram of calcium hydroxide in approximately 500 ml of water. Filter the solution to obtain a clear lime water solution. Collect carbon dioxide gas in a test tube by a suitable method. Pass the collected carbon dioxide gas through the lime water. If the lime water turns milky, this confirms the presence of carbon dioxide.Note: If more carbon dioxide is passed through the milky lime water, it becomes clear again as the calcium carbonate further reacts with carbon dioxide and water to form calcium hydrogencarbonate, which is soluble in water.
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a chemist determined by measurements that 0.0300 most of Beryllium oxide participate in a chemical reaction calculate the mass of Berlylium oxide that participates
Answer:
0.75g
Explanation:
From the given problem, the known parameters are:
Number of mole of BeO = 0.03mole
The unknown is the mass of BeO = ?
The formula of the compound is BeO
To solve this kind of problem, we use the mole relationship between number of mole and mass. This is expressed below mathematically:
Mass of BeO = number of moles of BeO x Molar mass of BeO
The molar mass of BeO:
Atomic mass of Be = 9g
Atomic mass of O = 16g
Molar mass of BeO = 9 + 16 = 25g/mol
Mass of BeO = 0.03 x 25 = 0.75g
The mass of BeO that participates is 0.75g
The mass of Beryllium oxide that participates in the chemical reaction is 0.7506 grams.
Explanation:To calculate the mass of Beryllium oxide that participates in the chemical reaction, we need to convert the given amount of moles to grams. The molar mass of Beryllium oxide (BeO) is 25.02 g/mol. Since we know that 0.0300 moles of BeO participate in the reaction, we can use the formula:
Mass = moles × molar mass
Mass = 0.0300 mol × 25.02 g/mol = 0.7506 g
Therefore, the mass of Beryllium oxide that participates in the chemical reaction is 0.7506 grams.
how many moles in 5 g of mg
Answer:
Explanation:
5 g Mg 1 mole Mg
* ___________ = 0.208333 moles Mg
24 grams Mg
24 is from the periodic table
Will vote brainliest!! Can someone please help me with the empirical formula of
C:46.66% H:4.48%
N:31.10% O:17.76%
I am getting 3C 4H 2N 1O but this is not one of the options so I don’t know if I’m doing it wrong or the question is wonky because I did all the others right
Answer:
It’s simple. You’re doing it right, the question is just messed up. If you think about it it’s like H2O
Explanation:
Answer:
The answer is C7H8N4O2.
Same problem as your other question - you rounded in a place where you shouldn't have (see explanation below, exact same process)!
Explanation:
These are percents by mass. Pretend you have a 100g sample. That means you have:
46.66g C
4.48g H
31.10g N
17.76g O
Divide each by molar mass to find the moles of each:
C: 46.66 / 12 = 3.89 mol
H: 4.48 / 1 = 4.48 mol
N: 31.10 / 14 = 2.22 mol
O: 17.76 / 16 = 1.11 mol
Now divide each of these values by the lowest of the three to find the ratio between each element in the compound:
C: 3.89 / 1.11 ≈ 3.5
H: 4.48 / 1.11 ≈ 4
N: 2.22 / 1.11 = 2
O: 1.11 / 1.11 = 1
As with your other question, 3.5 is too different from 3, so you can't round it down. The .5 makes it easy to find the LCD - it's 2. Multiply each of the numbers by 2 to get your final answer:
C: 3.5 x 2 = 7
H: 4 x 2 = 8
N: 2 x 2 = 4
O: 1 x 2 = 2
Again, if you were to take the percent masses of the empirical formula you came up with, you'll see they're quite different from the one the question provided, which is why you can't round in this situation.
Particles vibrate in a rigid structure and
do not move relative to their neighbors.
That would be a description of a solid if that’s what your looking for. If not ask me in the comments:)
Particles vibrate in a rigid structure and do not move relative to their neighbours. It is the property of solid.
What is solid?A solid is a state of matter that retains its shape and density when not confined.
Properties of solids: Solids have definite volume and shape.
Hence, particles vibrate in a rigid structure and do not move relative to their neighbours.
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What causes different colors to appear in the sky?
the absorption of light by air molecules
the reflection of light by bodies of water
the greenhouse effect in Earth's atmosphere
the scattering and reflection of light by dust particles
Answer:
the scattering and reflection of light by dust particles
Answer:
the scattering and reflection of light by dust particles
Explanation:
The process of scattering is responsible for the different colors we see in the sky.
Different colors have have some different wavelengths, and hence, scatter accordingly.
The small dust particles that is present in the air , gets scattered as the light falls on the dust particles , and hence give various colors to the sky , since , blue is the color that is scattered the most , therefore , maximum sky is blue in color .
Similarly during night time , there is no light , hence , the sky appears dark.
When balancing a chemical equation:
Answer: There must be the same number of atoms of each element on both sides of the equation.
Explanation: This is the only way the equations will be balanced. Adding the coefficients to see if they are equal will not guarantee that the equations are balanced becuase coefficients can be turned into subscripts.
The equation below shows a chemical reaction.
A + B + heat —> C + D
According to the law of conservation of energy, which statement is true?
A. The reactants absorb heat because they have less energy than the products.
B. The products release heat because they have more energy than the reactants.
C. The reactants generate heat because they have more energy than the products.
D. The products require heat to form because they have less energy than the reactants.
Answer:
A. The reactants absorb heat because they have less energy than the products.
Explanation:
According to the law of conservation of energy, energy can neither be created nor destroyed.
The given equation of the chemical reaction indicates that the reaction is endothermic as heat is absorbed by the reactants. In an exothermic reaction heat is released by the products.
In an endothermic reaction initially the heat of the reactants in less than the products, thus according to the law of conservation of energy, the reactants absorb heat such that there is equal amount of heat on both the reactant and product side.
A substance that will change shape to fit its container but has a definite volume is in a________ phase of matter.
A substance that will change its shape to fit its container, but has a definite volume, is in a liquid state of matter.
➤ ReasonThere are four (confirmed) states of matter, Solids, Liquids, Gasses, and Plasma. Solids, have definite shape and volume. Metalloids is a solid that does not have a definite shape, but does have an 'original' shape, the shape the metalloid was originally in. Liquids although have no original shape, although is does have a definite volume, which is how much space it takes up. Liquids will change to fit the shape of its container, so no matter what you put a liquid in, it will fit its container in some way or form. Water for example, being a liquid at room temperature, when pouring water into a bottle, you see it take the shape of the container, as supposed to. Gasses and Plasmas are a bit more complicated, so you could look those up if you'd like. I hope this helps you.
✧ Oh god, no, I dropped my phases of matter. Please, someone help me.╚═⋄═◇═◈═❖═✧═☆═✧═❖═◈═◇═⋄═╝Suppose you mix one mole of sulfuric acid (H2SO4) with 1 mole of sodium hydroxide(NaOH).
Why does the pH of the solution remain below 7?
(Please explain so I can get better understanding!)
Answer & Explanation:
The neutralization of H₂SO₄ with NaOH is occurred according to the balanced equation:H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O,
It is clear that every 1.0 mol of H₂SO₄ needs 2 mol of NaOH to be neutralized completely.
So, when you mix one mole of sulfuric acid with 1 mole of sodium hydroxide, there will be an excess of sulfuric acid.
Thus, the pH of the solution remain below 7.
What shape would a molecule with two bound groups and two lone pairs have?
Answer:
Bent.
Explanation:
A molecule with two bound groups and two lone pairs have a bent shape.
Hope this helps! Please mark brainliest!
Answer:
bent
Explanation:
How many miles of water are produced if 5.43 mol PBO2 are consumed
Answer:
Amount of oxygen = 2 * 5.43 moles
= 10.86 moles
Explanation:
Answer:Correct answer 10.9
Explanation:
Write a balanced nuclear reaction for the following:
216 Po → 0 β + ______
84 -1
When balancing the nuclear reaction, explain the following:
How does the Law of Conservation of Matter dictate what the daughter nuclide is?
How do we calculate the atomic mass and atomic number for the daughter nuclide?
Where do we look up what the new daughter nuclide element is?
Answer:
[tex]\rm ^{216}_{\phantom{2}84}Po \to ^{\phantom{-}0}_{-1}\beta + ^{216}_{\phantom{2}85}At[/tex].
Both mass number (A) and atomic number (Z) shall conserve. Hence the mass number of the daughter nuclide shall be 216 and its atomic number be 85.
Let the mass number of the daughter nuclide be [tex]A[/tex].
[tex]216 = 0 + A[/tex].
[tex]A = 216[/tex].
Let the atomic number of the daughter nuclide be [tex]Z[/tex].
[tex]84 = (-1) + Z[/tex].
[tex]Z = 85[/tex].
Look up the atomic number of the daughter nuclide in a modern periodic table. Alternatively, given that this reaction is a beta-minus decay, look for the element to the right of the parent nuclide.
Explanation:
Nuclides are made of neutrons and protons.
The atomic number (Z) is the number of protons in each of the nucleus. The mass number (A) is the number of protons plus neutrons in each of the nucleus.The mass number shall thus be greater than or equal to the atomic number of a nucleus. However, note that occasionally the atomic number of electrons (beta-minus particles) is written as -1. The atomic number of positrons (beta-plus particles, the antiparticle of electrons) is written as +1. Beta particles do not contain protons or neutrons and might not satisfy rule [tex]A \ge Z[/tex].
[tex]^{A}_{Z}\mathrm{X}[/tex].
By convention
The mass number of a nucleus is written at the upper-left corner of the atomic symbol. The atomic number of a nucleus is written at the lower-left corner of the atomic symbol.Both mass number and atomic number shall conserve in nuclear reactions. In other words, the sum of all mass numbers on the left-hand side of a nuclear equation shall be the same as the sum of all mass numbers on the right-hand side. So is the case with atomic numbers. For this nuclear equation,
Mass number on the left-hand side:
216 for [tex]^{216}_{\phantom{2}84}\mathrm{Po}[/tex].Mass numbers on the right-hand side:
0 for the beta-minus particle [tex]^{\phantom{-}0}_{-1}\beta^{-}[/tex], andLet [tex]A[/tex] be the mass number of the daughter nuclide [tex]^{A}_{Z}\mathrm{X}[/tex].Mass numbers conserve. Therefore,
[tex]216 = 0 + A[/tex].
[tex]A = 216[/tex].
Similarly,
Atomic number on the left-hand side:
[tex]84[/tex] for [tex]^{216}_{\phantom{2}84}\mathrm{Po}[/tex].Atomic numbers on the right-hand side:
"[tex]-1[/tex]" for the beta-minus particle [tex]^{\phantom{-}0}_{-1}\beta^{-}[/tex], andLet [tex]Z[/tex] be the atomic number of the daughter nuclide [tex]^{A}_{Z}\mathrm{X}[/tex].[tex]84 = (-1) + Z[/tex].
[tex]Z = 85[/tex].
Refer to a modern periodic table. What is the element with the atomic number [tex]Z = 85[/tex]? Astatine.
Alternatively, notice that the atomic number [tex]Z[/tex] has increased by [tex]1[/tex] relative to the parent nuclide [tex]\rm ^{216}_{\phantom{2}84}Po[/tex]. Elements on a modern periodic table are order in the increasing order of atomic numbers. As a result, the daughter nuclide shall be on the right of the parent element.
Complete the atomic symbol of the daughter nuclide:
[tex]\rm ^{216}_{\phantom{2}85}At[/tex].
Final answer:
The balanced nuclear equation for the decay of polonium-216 with an emission of a beta particle is: ^{216}Po_{84}
ightarrow 0_{-1}eta + ^{216}At_{85}. The daughter nuclide is astatine-216.
Explanation:
The student has asked to write a balanced nuclear reaction for the decay of polonium-216 (216Po) with an emission of a beta particle (0-1eta). The Law of Conservation of Matter dictates that the sum of the mass numbers (top numbers) and the atomic numbers (bottom numbers) must be the same on both sides of the reaction. This is a fundamental principle in balancing nuclear reactions, also known as nuclear accounting.
To find the daughter nuclide in the given decay reaction, we recognize that the emission of a beta particle (0-1eta) increases the atomic number by 1, but does not change the mass number. Thus, the daughter nuclide will have an atomic number of 85 and a mass number of 216. Since the periodic table is organized by atomic number, we can easily look up element 85 to find that it is astatine (At), making the daughter nuclide 216At.
The balanced nuclear equation is:
216Po84 ightarrow 0-1eta + 216At85
React 8 grams of copper (II) oxide (CuO) with 125 grams of hidrochloric acid (HCl) solution. Calculate the mass of the salt and water. The 125 grams is the mass of the HCl SOLUTION by means HCl have already dissolved in water. Thank you guys so much ;)))
Answer:
1) The mass of the produced salt (CuCl₂) = 13.45 g.
2) The mass of the produced water (H₂O) = 1.8 g.
Explanation:
The balanced chemical equation between CuO and HCl is:CuO + 2HCl → CuCl₂ + H₂O,
It is clear that 1 mol of CuO reacts with 2 mol of HCl to produce 1 mol of CuCl₂ and 1 mol of H₂O.
Firstly, we need to calculate the no. of moles of (8.0 g CuO) and (125.0 g HCl):no. of moles of CuO = mass/molar mass = (8.0 g)/(79.545 g/mol) = 0.1 mol.
no. of moles of HCl = mass/molar mass = (125.0 g)/(36.46 g/mol) = 3.43 mol.
From the balanced equation: CuO reacts with HCl with (1: 2) molar ratio.∴ 0.1 mol of CuO "limiting reactant" reacts with 0.2 mol of HCl "excess reactant".
To calculate the mass of the produced salt (CuCl₂):
1 mol of CuO produces → 1 mol of CuCl₂, from stichiometry.
∴ 0.1 mol of CuO produces → 0.1 mol of CuCl₂.
∴ The mass of the produced salt (CuCl₂) = (no. of moles)(molar mass) = (0.1 mol)(134.45 g/mol) = 13.45 g.
To calculate the mass of the produced salt (H₂O):
1 mol of CuO produces → 1 mol of H₂O, from stichiometry.
∴ 0.1 mol of CuO produces → 0.1 mol of H₂O.
∴ The mass of the produced water (H₂O) = (no. of moles)(molar mass) = (0.1 mol)(18.0 g/mol) = 1.8 g.
The atom fluorine generally will become _____ stable through the formation of an ionic chemical compound by accepting _______ electron(s) from another atom. This process will fill its outer energy level of electrons.
Answer:
more, negative
Explanation:
It will become more stable by combining the negative electrons.
The atom fluorine generally will become highly stable through the formation of an ionic chemical compound by accepting one electron from another atom. This process will fill its outer energy level of electrons.
Atomic number of fluorine is 9. The electronic configuration of fluorine is 2,7. Fluorine has 7 electrons in the valence shell, so it requires one electron to attain the noble gas configuration, which is highly stable.
Thus, we can conclude that through the formation of ionic chemical bonds fluorine become highly stable, by accepting one electron from another atom.
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A lab technician needs to create 570.0 milliliters of a 2.00 M solution of magnesium chloride (MgCl2). To make this solution, how many grams of magnesium chloride does the technician need?
Refer to the periodic table for help. Express your answer to three significant figures.
Answer:
108.3g
Explanation:
Given parameters:
Volume of solution = 570mm = 0.57L (1000mm = 1L)
Molarity of solution = 2M
Unknown
Mass of MgCl₂
Solution
We first find the number of moles in the given concentration of magnessium chloride using the expression below:
Number of moles of MgCl₂= Molarity x volume = 2 x 0.57 = 1.14moles
Using this known moles, we can the unknown mass of MgCl₂ the technician would require:
Mass of MgCl₂ required = number of moles of MgCl₂ x molar mass
Molar mass of MgCl₂:
Atomic mass of Cl = 35.5g
Atomic mass of Mg = 24g
MgCl₂ = 24 + (35.5x2) = 95gmol⁻¹
Mass of MgCl₂ required = 1.14mole x 95gmole⁻¹ = 108.3g
The required mass is 109 grams.
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