# A little homework Help…?

11. Karen measures the volume of a gas at 200 K and 100 kPa. To correct her measurement to standard temperature and pressure (STP), what must she do?

(Points : 3)

make a volume correction based on a higher pressure of 200 kPa

make a volume correction based on a higher temperature of 273 K

make a volume correction based on a lower pressure of 50 kPa

make a volume correction based on a lower temperature of 73 K

12. A 3.00 L flexible container holds a sample of hydrogen gas at 153 kPa. If the pressure increases to 304 kPa and the temperature remains constant, what will the volume be?

(Points : 3)

0.66 L

1.51 L

2.26 L

4.50 L

13. A 3.0 L container holds a sample of hydrogen gas at 300 K. If the temperature decreases to 200 K and the pressure remains constant, what will the volume be?

(Points : 3)

0.1 L

0.5 L

1.0 L

2.0 L

14. You compare the gas generated from a reaction using two antacid tablets with the gas generated from a reaction using four antacid tablets (consider the antacid as the limiting reagent). At constant pressure and temperature, how do the volumes of the gases compare?

(Points : 3)

The gas generated by four antacid tablets has a smaller volume.

The two reactions produce the same amount of gas.

The gas generated by two antacid tablets has a smaller volume.

15. A 3.0 L container holds a sample of hydrogen gas at 300 K and 101.5 kPa. If the pressure increases to 305 kPa and the volume remains constant, what will the temperature be?

(Points : 3)

901 K

605 K

103 K

100 K

16. Which of the following is the mathematical representation of Charles's law?

(Points : 3)

P1V1 = V2/T2

P1V1 = P2V2

P1/T1 = P2/T2

V1/T1 = V2/T2

17. The following question appears on a quiz: "You fill a tank with gas at 60°C to 100 kPa and seal it. You decrease the temperature to 10°C but keep the volume constant. What happens to the pressure?" The student answers that the new pressure will be 17 kPa. Which of the following explanations is true?

(Points : 3)

The student did not work with absolute temperatures, and the answer should be 85 kPa.

The student did not solve for the correct parameter, and the answer should be 600 kPa.

The student did not solve for the correct parameter, and the answer should be 50 kPa.

The student did not work with absolute temperatures, and the answer should be 888 kPa.

18. A balloon contains 2.0 L of air at 101.5 kPa. You squeeze the balloon to a volume of 0.5 L. What is the pressure of air inside the balloon?

(Points : 3)

13 kPa

101 kPa

406 kPa

812 kPa

19. You place a balloon in a closed chamber at STP. You double the chamber pressure. What happens to the balloon?

(Points : 3)

It reduces to one-half the original volume.

It stays the same volume.

It doubles in volume.

It expands to four times the original volume.

20. In a problem, you are given two volumes and one pressure at a constant temperature and amount of gas. You are asked to find a second pressure. What law should you use?

(Points : 3)

Charles's law

Boyle's law

Gɑץ-Lussac's law

• This is chemistry, not math.

make a volume correction based on a higher temperature of 273 K

1.51 L

2.0 L

The gas generated by two antacid tablets has a smaller volume.

?

?

?

406 kPa

It reduces to one-half the original volume.

?

• 11. make a volume correction based on a higher temperature of 273 K (technically, 273.15 K).

12. 1.51L

13. 2.0L

14. The gas generated by two antacid tablets has a smaller volume.

15. 901K

16. V1/T1 = V2/T2

17. The student did not work with absolute temperatures, and the answer should be 85 kPa.

18. 406 kPa

19. It reduces to one-half the original volume.

20. Boyle's Law