How many moles of mgci2 are there in 332 g of the compound

Answers

Answer 1

Answer: find molar mass of MgCl2 so M=95.211 g/mol
N=m/M
N=332/95.2
N=3.487
dont forget to round your sig figs

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How many molecules are in 9.8 grams of calcium

Answers

Hmm
One mole of calcium is usually equal to 40 grams so divide 9.8 by 40 which would be 4.0 molecules

20 Which term is defined as a measure of the disorder of a system?(1) heat (3) kinetic energy
(2) entropy (4) activation energy

Answers

Entropy is the term defined as a measure of the disorder of a system. This occurs mainly when the thermal energy is not available for the mechanical things.

Heat is a measure of energy in a medium
Kinetic energy is a measure of energy in an object that's resulting in movement
Activation energy is the amount of energy required to start a chemical reaction
Entropy is a measure of disorder in a system
The answer is Entropy

Calculate the molar solubility of calcium hydroxide in a solution buffered at each of the following pH's. pH 5, pH 7, pH 10

Answers

Calcium hydroxide dissolves and dissociates according to:
Ca(OH)₂(s) ⇄ Ca²⁺(aq) + 2 OH⁻(aq) therefore the answer is PH7

In which sample of water do the molecules have the highest average kinetic energy?(1) 20. mL at 100.°C (3) 60. mL at 60.°C
(2) 40. mL at 80.°C (4) 80. mL at 40.°C

Answers

The answer is (1). The question is asking the average kinetic energy. So it does not related with volume. When temperature increases, the kinetic energy will also increase. So the answer should be the highest temperature.

What are four physical properties of aluminum foil?

Answers

1) solid
2) ductile
3) malleable
4) silver in color

Malleable means that it is "flexible" or can be permanently reshaped easily. Ductile means that it can be drawn out into a wire. Aluminum foil's state of matter is solid, and it appears in a silver color.

Solid

Shiny

Dole

Conductor if electricity

Which statement best describes the collisions of gas particles according to the kinetic-molecular theory? a. When particles pass close enough to one another, their attractions pull them together, and then they bounce apart with no gain or loss of energy.
b. As particles travel in straight lines, their paths sometimes meet, and then they bounce apart with no gain or loss of energy.
c. When particles pass close enough to one another, their attractions pull them together, and then they bounce apart with a loss of energy.
d.As particles travel in straight lines, their paths sometimes meet, and then they bounce apart with a loss of energy.

Answers

Answer:

b. As particles travel in straight lines, their paths sometimes meet, and then they bounce apart with no gain or loss of energy.

Explanation:

Kinetic - molecular theory -

According to this theory , gas is considered to be as a large number of very small particles , which moves randomly , and due to this randomness collisions occurs , as the particles collide with each other and the wall of the container .

During these collisions , there is no loss or gain of energy , there is only transfer of energy .

Answer:

As particles travel in straight lines, their paths sometimes meet, and then they bounce apart with no gain or loss of energy.

Explanation:

Was right on edge

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