Gas Laws Test

Question 1

Charles law

Answer 1

V1/T1 = V2/T2

Question 2

Gay-lussac’s law

Answer 2

P1/T1 = P2/T2

Question 3

Combined gas law

Answer 3

P1V1/T1 = P2V2/T2

Question 4

According to gay-lussac’s law, at constant volume, as the temperature increases, the pressure always ___________.

Answer 4

Increases

Question 5

According to Boyle’s law, at constant temperature, as the volume increases, the pressure always ____________.

Answer 5

Decreases

Question 6

According to Charles’ law, at constant pressure, as the temperature increases, the volume always __________.

Answer 6

Increases

Question 7

At constant temperature, the volume of a gas expands from 10 L to 23 L. If the initial pressure was 103.72 kPa, what is the final pressure?

Answer 7

45.1 kPa

Question 8

The volume of a gas was originally 3.6 L; it’s pressure was 116 kPa and its temperature was 293 K. The volume of the gas expanded to 7.2 L and it’s pressure decreased to 102 kPa. What is the temperature of the gas?

Answer 8

513.3 K

Question 9

At constant pressure, a gas is heated from 200 K to 400K. After heating, the volume of the gas was 10 L. What was the initial volume of the gas?

Answer 9

5 L

Question 10

What is the molar mass of a gas at 20 degrees C with a volume of 5.6 L and a pressure of 115 kPa if there are 17 grams of it?

Answer 10

64.3 g/mol

Question 11

Oxygen gas has a pressure of 315 kPa in a container of 53 L and a temperature of 6 degrees C. What is the mass of the gas?

Answer 11

230.3 g

Question 12

What is STP?

Answer 12

101.325 kPa, 273 K

Question 13

A quantity of oxygen gas was collected over water at 10 degrees C in a 6.75 ml container. The pressure in the container was measured to be 95 kPa. How many grams of oxygen gas were collected?

Answer 13

0.0086 g

Question 14

Oxygen gas was collected over water at 25 degrees C. The pressure in the 3.1 L container was 121 kPa. If the container was allowed to expand to 9.3 L and if the temperature was decreased to -25 degrees C, what is the final pressure of the dry oxygen gas?

Answer 14

32.7 kPa

Question 15

How is vaporization of water affected by temperature?

Answer 15

As the temperature increases, the vaporization of water increases

Question 16

Nitrogen gas can be produced by reacting Na3N with chlorine gas. If the reaction was carried out at STP with 34.8 g of Na3N, what volume of nitrogen gas can be produced? (List steps)

Answer 16

1) balanced equation
2) MPV=mRT to find moles Na3N
3) convert

Answer: 4.7 L N2

Question 17

How many grams of sodium are required to produce 31.9 L of H2 at 97 kPa and 290 K according to the following balanced equation?
2HNO3 + 2Na –> 2NaNO3 + H2
(List steps)

Answer 17

1) PV=nRT to find moles
2) change moles of H2 from PV=nRT to mol of Na
3) convert mol to g

58.9 g Na

Question 18

Boyles law

Answer 18

(P1)(V1) = (P2)(V2)