Answer:
your answer is D -_- bc they want the approximate
Answer:
Option A. 3 × 10^21 molecules
Explanation:
From Avogadro's hypothesis, 1mole of any substance contains 6.02x10^23 molecules. This means that 1mole of H20 also contains 6.02x10^23 molecules.
1mole of H2O = (2x1) + 16 = 2 + 16 = 18g
If 1mole(i.e 18g) of H2O contains 6.02x10^23 molecules,
Therefore 0.1g of H2O will contain = (0.1 x 6.02x10^23) /18 = 3 x 10^21 molecules
What is the total amount of heat released when 94.0 g water at 80.0 °C cools to form ice at −30.0 °C?
Answer:
The total amount of heat released is 68.7 kJ
Explanation:
Given that:
mass of water = 94.0 g
moles of water = 94 / 18.02 = 5.216
80⁰C ------> 0⁰C --------> -30⁰C
Q1 = m Cp dT
= 94 x 4.184 x (0 - 80)
= -31463.68 J
= -31.43 kJ
Q2 = 6.01 x 10^3 x 5.216
= - 31348.16 J
= -31.35 kJ
Q3 = - 94 x 2.09 x 30
= - 5893.8 J
= -5.894 kJ
Total heat = Q1 + Q2 + Q3 = -31.43 kJ + (-31.35 kJ ) + (-5.894 kJ ) = -68.7 kJ
Total heat released = -68.7 kJ
Note that the "negative sign" simply indicates heat released, therefore no need to put it in the answer.
The total amount of heat released is 68.7 kJ.
Given:
Mass of water = 94.0 g
Moles of water = 94 / 18.02 = 5.216
Transformation of heat:80⁰C ------> 0⁰C --------> -30⁰C
Q₁ = m*Cp*dT
= 94 * 4.184 * (0 - 80)
= -31463.68 J
Q₁ = -31.43 kJ
Q₂ = 6.01 * 10³ * 5.216
= - 31348.16 J
Q₂ = -31.35 kJ
Q₃ = - 94 * 2.09 * 30
= - 5893.8 J
Q₃ = -5.894 kJ
Total heat = Q₁ + Q₂ + Q₃
Total heat = -31.43 kJ + (-31.35 kJ ) + (-5.894 kJ ) = -68.7 kJ
Total heat = -68.7 kJ
Total heat released = -68.7 kJ
Find more information about Heat released here:
brainly.com/question/13439286
Write a balanced equation for zinc sulfate heptahydrate + sodium carbonate —> zinc carbonate + sodium sulfate
Answer:
I gotta go - but think heat or solubility, what can you drive away with heat and by what is it is not soluble...it is a catch all answer - but rarely is there ONE WAY ONLY! Good luck.
Explanation:
The balanced chemical equation for the reaction between zinc sulfate heptahydrate and sodium carbonate is: ZnSO₄•7H₂O + Na₂CO₃ → ZnCO₃ + Na₂SO₄ + 7H₂O.
To write a balanced chemical equation for the reaction between zinc sulfate heptahydrate (ZnSO₄•7H₂O) and sodium carbonate (Na₂CO₃), we follow these steps:
Step-by-Step Solution:
Write the unbalanced equation: ZnSO₄•7H₂O + Na₂CO₃ → ZnCO₃ + Na₂SO₄ + 7H₂OIdentify the states of the compounds: ZnSO₄•7H₂O (aq), Na₂CO₃ (aq), ZnCO₃ (s), Na₂SO₄ (aq), 7H₂O (l).Break down the compounds into their respective ions:Balanced Equation:
ZnSO₄•7H₂O (aq) + Na₂CO₃ (aq) → ZnCO₃ (s) + Na₂SO₄ (aq) + 7H₂O (l)What is the molarity of 0.50 liter of an aqueous solution that contains 0.20 mole of NaOH (gram-formula mass = 40. g/mol)?
Answer:
0.4mol/L
Explanation:
Data obtained from the question include:
Number of mole of NaOH(solute) = 0.20 mole
Volume of solution = 0.50 L
Molarity =.?
Molarity is simply mole of solute per unit litre of a solution. This can represented mathematically as:
Molarity = mole of solute /Volume of solution
Molarity of NaOH = 0.2mol/0.5L
Molarity of NaOH = 0.4mol/L
Answer:
0.4 mol
Explanation:
Which statement best describes the kinetic molecular
theory?
The kinetic molecular theory relates the properties of a state of matter to the motion of
its molecules.
B
The kinetic molecular theory relates the properties of a state of matter to the mass of its
molecules.
C
The kinetic molecular theory relates the properties of a state of matter to the size of its
molecules.
D
The kinetic molecular theory relates the properties of a state of matter to the diameter of
its molecules.
The kinetic molecular theory is best illustrated by the statement that the properties of a state of matter is associated with the motion of its molecules.
Kinetic molecular theory:According to the kinetic molecular theory, all the matter is formed of particles, which are in motion spontaneously. All the particles possess energy, however, the energy changes based upon the temperature of the sample of matter. This is further determined by the fact that whether the substance prevails in liquid, solid, or gaseous state.
In the solid phase, the molecules exhibit the least amount of energy, while the particles of gas exhibits the highest amount of energy. According to the kinetic molecular theory, all the particles of gas are in spontaneous motion and exhibit perfectly elastic collisions.
Thus, the correct statement is option A.
Find out more information about kinetic molecular theory here:
https://brainly.com/question/2901837
The kinetic molecular theory best describes the properties of a state of matter as being related to the motion of its molecules, not their mass, size, or diameter.
Explanation:The kinetic molecular theory is a model that explains the properties and behavior of matter, particularly in the state of gases. The theory posits that matter is made up of tiny particles that are always in motion. This motion is responsible for the observable properties of solids, liquids, and gases. The theory is most applicable to an ideal gas, which is a hypothetical gas that perfectly adheres to the kinetic molecular theory's assumptions, with molecules that are in constant motion, having negligible volume, colliding elastically, and with a distribution of speeds dependent on temperature.
In relation to the question, which statement best describes the kinetic molecular theory, the correct answer is:(A). The kinetic molecular theory relates the properties of a state of matter to the motion of its molecules.
Please this is due tomorrow!!!
A little quantity of trichloromethane (b.pt. 60° C) was added to a large quantity of ethanol (b.pt. 78°C). The most probable boiling point of the
resultant mixture is from
A. 69°C - 70°C
B. 70°C - 74°C
C. 82°C - 84°C
D. 60°C - 78°C
Answer:
the correct answer is C
The boiling point of the mixture of trichloromethane and ethanol is likely to be within the range of 60°C to 78°C. However, due to the larger quantity of ethanol with a higher boiling point, it is likely to be closer to 78°C.
Explanation:The boiling point of a mixture depends on the individual components and their proportions. Here, we have trichloromethane (boiling point 60°C) and ethanol (boiling point 78°C). Even though a small quantity of trichloromethane is added, since the boiling point of ethanol is higher, it is likely that the mixture will start to boil close to the boiling point of ethanol. The boiling point of most mixtures is typically within the range of the components' boiling points.
Therefore, we can say that answer D (60°C - 78°C) is a likely range for the resultant boiling point of the mixture, but the actual boiling point is more likely to be closer to 78°C, the boiling point of ethanol. The specific boiling point would depend on the exact proportions of the two substances in the mixture.
Learn more about Boiling Point here:https://brainly.com/question/34261956
#SPJ2
What numbers should be added to the blanks to balance this chemical equation? ___F2 + __ H20 --------> ___OF2 + ___HF
A) 2,2,1,2
B)2,1,1,2
C)3,2,1,4
D)1,2,2,1
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
[tex]2F_2+H_2O\rightarrow OF_2+2HF[/tex]
Thus in the reactants, there are 2 atoms of hydrogen , 1 atom of oxygen and 4 atoms of flourine.Thus there will be atoms of hydrogen , 1 atom of oxygen and 4 atoms of flourine in the product as well.
Learn more about conservation of mass
https://brainly.com/question/12335419
https://brainly.com/question/11954533
hello:) ice is pure liquid which means that it’s a pure substance , is this true? anyone able to correct me if I’m wrong & explain too? Thank you!
Answer:
A pure substance is a substance composed of one substance. It has fixed physical and chemical properties. It has special chemical symbols, which can be expressed by a chemical formula. Water is pure, so what you mean by liquid ice is pure.
Explanation:
Answer:
Ice is a pure liquid
what is caliper used for
A caliper is a device used to measure the distance between two opposite sides of an object.
which is a determine factor for the direction a motor spins in an electric motor.
Answer:
Magnet determine factor for the direction a motor spins in an electric motor.
What does fossil mean in my own words
Answer: A thing that died a long time ago, and it's bones were preserved in the ground.
Explanation:
Because yes
How many moles of calcium carbonate-CaCO3 = 4.15 g
Answer:
Number of moles = 0.042 mol
Explanation:
Given data:
Number of moles = ?
Mass of calcium carbonate = ?
Solution:
Formula:
Number of moles = mass/ molar mass
now we will calculate the molar mass of calcium carbonate.
atomic mass of Ca = 40 amu
atomic mass of C = 12 amu
atomic mass of O = 16 amu
CaCO₃ = 40 + 12+ 3×16
CaCO₃ = 40 + 12+48
CaCO₃ = 100 g/mol
Now we will calculate the number of moles.
Number of moles = 4.15 g / 100 g/mol
Number of moles = 0.042 mol
A 13.8 g sample of X reacts with a sample of Y to form 68.3 g of XY.What is the mass of Y that reacted
54.5 grams of Y reacted with 13.8 g sample of X to form 68.3 g of XY.
Explanation:
In chemical reaction the mass remains conserved until the dissipation or lost is shown. In the question it is mentioned that 13.gm of X reacts with some amount of Y to form a product XY of mass 68.3 grams.
The reaction given is addition reaction in which two elements react to for a compound.
X + Y ⇒ XY
So, in the chemical reaction value of mass is put as
13.8 + Y = 68.3
Y = 68.3-13.8
Y = 54.5 grams
If 8.00 miles of NH3 of 10.00 moles of O2 react in the following reaction, how many moles of which reactant will be left over
Answer:
No moles will be left over of either reactant because both are limiting.
Explanation:
4NH₃ + 5O₂ → 4NO + 6H₂O
8 mol 10 mol
you need to make 1.5L of 1.0M HCl from a stock solution of 12.0M HCl. How many L of the stock solution do you need?
Answer:
125 ml of HCl
Explanation:
The molarity of the stock solution to determine how many milliliters would contain 1.5 moles of HCl. Since a concentration of 12.0 mol/L means that you get 12.0 moles of hydrochloric acid per liter of solution,
Concentration of required HCl (C1) = 1.0M
Volume of required HCL (V1) = 1500 ml
Concentration of stock HCl (C2) = 12M
Volume of stock HCL (V2) = ?
C1V1 = C2V2
V2 = C1V1/C2 = 1*1500/12 = 125 ml
To make a 1.0M HCl solution from a stock solution of 12.0M HCl, you need to take 125mL of the stock solution and dilute it to a final volume of 1.5L.
Explanation:To make a 1.0M HCl solution, you need to dilute a stock solution of 12.0M HCl. The formula to calculate the volume of stock solution needed is (C1 x V1) = (C2 x V2), where C1 is the concentration of the stock solution, V1 is the volume of stock solution needed, C2 is the desired concentration, and V2 is the final volume. In this case, C1 = 12.0M, V2 = 1.5L, and C2 = 1.0M.
Plugging in these values into the formula:
(12.0M x V1) = (1.0M x 1.5L)
Solving for V1:
V1 = (1.0M x 1.5L) / 12.0M = 0.125L or 125mL.
Therefore, you need to take 125mL of the stock solution to make 1.5L of 1.0M HCl.
A reaction of 12.640 g of copper
oxide with 0.316 g hydrogen
produces 2.844 g of water and Xg
of copper. X=_9
Answer: it’s 10.112
Explanation:
This question relates to the law of conservation of mass in a chemical reaction. Following this law, the weight of copper (X) can be found by subtracting the weights of water and hydrogen from the weight of initial copper oxide. The calculated copper weight will be approximately 9.48g.
Explanation:This question relates to a chemical reaction which suggests you are being asked to understand the law of conservation of mass. In a chemical reaction, mass cannot be created or destroyed, only rearranged. The correct method to solve this problem is to add the mass of the water produced and the mass of copper produced and use this total to find the mass of the copper.
If we add the weight of water (2.844g) and the weight of copper (which is given to be 'X'), we will get the total weight of copper oxide, because in a reaction, the total mass of the reactants is equal to the total mass of the products. From the problem, we know that total weight of copper oxide is 12.640g. So
X = 12.640g (Copper Oxide) - 2.844g (Water) - 0.316g (Hydrogen)
When we calculate this we find that X = 9.480g.
Learn more about Conservation of Mass here:https://brainly.com/question/33386293
#SPJ3
are plastic bags organic or inorganic?
Answer:
nilon is inorganic so they can be in the soil up to 5000 years
Explanation:
Answer: The answer would be INORGANIC
Explanation:
i did the test
the muscle layer of the heart is known as the
Answer:
Myocardium
Explanation:
myo means "of muscle" or "relating to muscle"
cardium denotes tissues or cells that are associated with the heart.
The myocardium is an involuntary (we don't have to actively contract it), smooth muscle. The cells that make up the muscle are called cardiomyocytes.
These cells/tissues are hugely important for the normal functioning of the heart, and disruption is associated with diseases such as ischemic heart disease.
Compare and contrast the properties of acids and bases. Include two similarities and two differences.
Explanation:
Similarities
All acids and bases dissociate into ions, whether fully or partially, when dissolved in waterBoth are good conductors of electricity because they are made of electrolytesDifferences
Acids dissociate in water to create more H+ ions that lower the pH of the solution while bases dissociated into OH- that increase the pH of the water Acids are mainly proton donors while bases are proton acceptors11.
In the 1930s, how did Dobzhansky and Mayr explain the origin of species?
Species originate due to gradual adaptations to the environment.
Species originate from interbreeding.
Species originate through allopatric speciation.
Species originate due to behavioral changes.
Answer:
species originate through allopatric speciation:
Have a good day! :)
Answer:
species originate through allopatric speciation
Explanation:
1.Intramolecular forces are between
aMolecules
bAtoms within a molecule.
cProtons and electrons
dProtons and neutrons
Answer:
b Atoms within a molecule
Explanation:
Intramolecular forces are usually found within a molecule. Molecules are made up of combinations of atoms.
They are also called interatomic forces which joins atoms together to form another atom.
These bond types determines the chemical properties of substances.
Examples are:
Ionic bondsPure covalent bondsCoordinate covalent bondsMetallic bondsMatch the academic requirements with the careers . Cosmetologist
Answer:
Technical program - cosmetologist
To match academic requirements with a career as a Cosmetologist, one must attend Beauty School and obtain certification, with an option for higher learning for career enhancement. This career is suitable for those with an interest in beauty, who enjoy client interaction, and who are willing to engage in continuous learning.
To align academic requirements with careers such as that of a Cosmetologist, you must consider several factors. You would need to attend a Beauty School to obtain professional certification and perhaps, depending on where you aim to practice, a state license. The nature of this career fits those who have an artistic flair and a passion for beauty and personal care. While a college degree is not typically required for a career in cosmetology, attending a reputable institution can enhance your skills and open doors for career advancement.
For anyone evaluating if a cosmetology program matches their career goals, you must contemplate if you have an interest in delivering beauty services and if you wish to continuously develop your service portfolio. Given its hands-on nature, consider, too, if you enjoy interacting with clients on a day-to-day basis. Furthermore, as a Cosmetologist, continuous learning to keep up with beauty trends and health regulations is essential. Finally, determine if the role satisfies your personal goals for creativity, social interaction, and potentially owning a business.
Different careers and their associated academic requirements will vary. Some careers, like those in law or medicine, require extensive postgraduate education, licenses, and certifications, whereas for others, such as a Cosmetologist, the educational path is less academic and more skills-focused. However, even within such vocational careers, individual programs may have special requirements, including additional coursework in health, safety, or business management, to ensure you are well-prepared for the challenges of the job.
Element Y has two natural isotopes Y-63 (62.940 amu) and Y-65 (64.928 amu). Calculate the atomic mass of element Y, given the abundance of Y-63 is 69.17%?
Answer:
Average atomic mass = 63.553 amu.
Explanation:
Given data:
Abundance of Y-63 = 69.17%
Abundance of Y-65 = 100 - 69.17 = 30.83%
Atomic mass of Y-63 = 62.940 amu
Atomic mass of Y-65 = 64.928 amu
Atomic mass of Y = ?
Solution:
Average atomic mass= (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass= (62.940×69.17)+(64.928×30.83) /100
Average atomic mass = 4353.560 + 2001.730 / 100
Average atomic mass = 6355.29 / 100
Average atomic mass = 63.553 amu.
To calculate the atomic mass of element Y, use the formula that considers the abundance of each isotope and its corresponding mass.
Explanation:To calculate the atomic mass of element Y, we need to consider the abundance of each isotope and its corresponding mass. We can use the formula:
Average atomic mass = (mass of isotope A x abundance of isotope A) + (mass of isotope B x abundance of isotope B)
Plugging in the values:
Average atomic mass = (62.940 amu x 0.6917) + (64.928 amu x 0.3083) = 63.55 amu
Learn more about Atomic Mass here:https://brainly.com/question/32442642
#SPJ3
Calculate the volume of 0.413 mol of hydrogen gas at a temperature of 20°C and a pressure of 1200 torr.
Answer:
The volume is 6, 28 liters
Explanation:
The unit of pressure and temperature must be converted. 760 Torr = 1 atm and 0°C=273 K. 20+273=293K
760 Torr---1 atm
1200Torr--x= (1200 Torr x 1 atm)/760 Torr =1,58 atm
PV=nRT V=(nRT)/P
V= (0,413 mol x 0,082 L atm /K mol x 293K)/ 1,58 atm
V=6, 28 L
Question 2
What is the freezing point of water in Celcius
0°C
Explanation:
The freezing point of water is zero (0) degrees Celsius. Converted to Kelvin it is 273.15 kelvin. At these temperatures pure liquid water, and at 1 atm, changes to ice. The boiling point of water, on the other hand, is 100 degrees Celsius, temperatures at which liquid changes to a gaseous phase (water vapour).
What is the objective of sustainable development? Sustainable development is concerned with meeting needs without jeopardizing the needs of generations.
Answer:
To meet the needs of the present without jeopardizing that of the future.
Explanation:
Sustainable development applies to all faculties of resource allocation. Most available resources are limited in their capacity to satisfy our limited human wants.
Sustainable development is such development geared towards satisfying the developmental needs of our present generation without endangering those of the future generations. It allows for safe and efficient use/allocation of resources to meet wants. Conservation of resources is an approach towards sustainable development. The use of recycled materials is one method of attaining the obligations of sustainable development.Answer:
Explanation:
Present
Future
Why does food have potential energy?
Answer:
So that if we feel weak, energy is released through it so we can do work and do stuff like walk or think. It's like stored energy that can do things for the future.
Please give brainliest if it helped.
Food has potential energy because it contains stored chemical energy. The potential energy in food comes from the energy captured by plants through the process of photosynthesis.
During photosynthesis, plants convert sunlight, water, and carbon dioxide into glucose and other organic molecules.
Glucose, along with other carbohydrates, fats, and proteins present in food, is a rich source of potential energy.
The energy stored in these molecules is in the form of chemical bonds. When we consume food, our bodies break down these complex molecules through digestion and metabolic processes.
To learn more about potential energy, follow the link:
https://brainly.com/question/24284560
#SPJ6
What type of energy does a rock resting on top of a hill have?
Electrical energy
Kinetic energy
Potential energy
Radiant energy
Answer:
Potential energy
Explanation:
How many Liters are in 13 moles Acetylene (C2H2) at STP?
Answer:
291.2L
Explanation:
Given parameters:
Number of moles of acetylene = 13moles
Unknown:
Volume of acetylene at STP = ?
Solution:
The problem can be solved by applying the equation that shows the relationship between the volume of gases at STP and their number of moles.
Volume of gas at STP = number of moles x 22.4
Input the variables and solve;
Volume of gas at STP = 13 x 22.4 = 291.2L
Final answer:
To find the number of Liters in 13 moles of Acetylene (C2H2) at STP, we use the Ideal Gas Law equation. Plugging in the given values, we find that there are approximately 302.19 Liters.
Explanation:
To determine the number of liters in 13 moles of acetylene (C2H2) at STP, we need to use the Ideal Gas Law. The Ideal Gas Law equation is PV = nRT, where P is pressure, V is volume, n is moles, R is the ideal gas constant, and T is temperature. At STP (standard temperature and pressure), the pressure is 1 atm and the temperature is 273.15 K. Since we are given the number of moles (13) and want to find the volume, we rearrange the equation to solve for V: V = nRT/P.
Plugging in the values, we get V = (13 mol)(0.08206 L·atm/mol·K)(273.15 K)/(1 atm) = 302.19 L.
How many covalent bonds does and oxygen stone usually make in forming covalent compounds?
a) 5
b) 3
c) 2
d)4
e)1
Answer: Oxygen usually forms two covalent bonds or a covalent double bond.
Explanation:
A covalent bond is formed by the sharing of 2 electrons, 1 electron from each of the atoms sharing their electrons.
The number of bonds that each element can form depends on the number of valence (outermost) electrons it contains. Oxygen has 6 electrons in its valence shell and needs 2 more electrons thereby forming a double bond.
is ammonium hydroxide a strong base
Answer:
No
Explanation:
Ammonium hydroxide is a weak base and not a strong base.
What is a base?
A base is any substance that interacts with water to produce or yield excess hydroxide ions in an aqueous solution.A strong base is one that ionizes completely in solution. Most strong bases are hydroxides of alkali and alkaline earth metals.
A weak base is one that partially or slightly ionizes in an aqueous solution.
Such is ammonium hydroxide;
NH₃ + H₂O ⇄ NH₄⁺ + OH⁻
In the ionization of a weak base, the process results in an equilibrium reaction.