Boyle’s Law Worksheet



NAME: ___________________________________________________________________ DATE: ___________

Boyle's Law Practice Problems

DIRECTIONS: For each problem below, provide the given, formula, substitution, and answer. Round answers to the nearest hundredth. #1 has been done for you.

1. What volume will 50 ml of a gas at 725 Torrs occupy if the pressure is increased to 760 Torrs?

GIVEN: V1= 50 ml P1= 725 Torrs P2= 760 Torrs

FORMULA: P1V1 = P2V2 V2= P1V1

P2

SUBSTITUTION: V2= (725 Torrs) (50 mL)

(760 Torrs)

Answer: 47.70 mL

2. A gas occupies 250 ml when the barometer reads 720 mm. How many milliliters will it occupy when the barometer reads 740 mm?

a) What do you predict will happen to volume? (increase/decrease)

GIVEN:

FORMULA:

SUBSTITUTION:

ANSWER: ___________________

3. Find the volume of a gas at standard pressure if its volume at 780 mm Hg is 80 ml? (HINT: Standard pressure = 760 mm Hg)

GIVEN:

FORMULA:

SUBSTITUTION:

ANSWER: ___________________

4. If the volume of a gas, at constant temperature, changes from 200 ml to 500 ml, the pressure on the gas must have changed from 400 Torrs to ____________.

a) What do you predict will happen to pressure? (increase/decrease)

GIVEN:

FORMULA:

SUBSTITUTION:

ANSWER: ___________________

5. Boyle’s Law describes the relationship between ___________ and _____________, and they are ___________ proportional. The variables __________ and ___________ remain constant.

6. A balloon is filled with 73 L of air at 1.3 atm pressure. What pressure is needed to change the volume to 43 L?

GIVEN:

FORMULA:

SUBSTITUTION:

ANSWER: ___________________

7. If 50 mL of Oxygen gas is compressed from 20 atm of pressure to 40 atm of pressure, what is the new volume at constant temperature?

GIVEN:

FORMULA:

SUBSTITUTION:

ANSWER: ___________________

8. If a gas sample in a balloon had a volume of 100 mL and a pressure of 3 atm. It was then compressed to a pressure of 10 atm, what would be its volume?

GIVEN:

FORMULA:

SUBSTITUTION:

ANSWER: ___________________

9. At 0.75 atm, the volume of a gas is 300 ml. If the temperature remains constant

and the pressure is changed to 456 Torrs, what is the new volume of the gas?

GIVEN:

FORMULA:

SUBSTITUTION:

ANSWER: ___________________

Boyle’s Law Worksheet

ANSWER KEY

P1V1 = P2V2

V2 = P1V1/P2

1. What volume will 50 ml of a gas at 725 Torrs occupy if the pressure is increased to 760 Torrs?

V2 = 50 ml x (725 Torr/760 Torr) = 47.7 ml

2. A gas occupies 250 ml when the barometer reads 720 mm. How many ml will it occupy when the barometer reads 740 mm?

V2 = 250 ml x (720 Torr/760 Torr) = 243.2 ml

3. Find the volume of a gas at standard pressure if its volume at 780 mm Hg is 80 ml?

V2 = 80 ml x (780 mm/760 mm) = 82.1 ml

4. Find the volume of a gas which occupies 200 ml at 2.6 atm when it is at standard pressure.

V2 = 200 ml x (2.6 atm/1 atm) = 520 ml

5. Correct 36.0 L of a gas at 0.650 atm to standard pressure.

V2 = 36 L x (0.65 atm/1 atm) = 23.4 L

6. Correct 232 ml of gas at 1.75 atm to 7 atm.

V2 = 232 ml x (1.75 atm/7 atm) = 58 ml

7. At 0.75 atm, the volume of a gas is 300 ml. If the temperature remains constant and the pressure is changed to 456 Torrs, what is the new volume of the gas?

V2 = 300 ml x (570 Torr/456 Torr) = 375 ml

V2 = 300 ml x (0.75 atm/ 0.6 atm) = 375 ml

8. If the volume of a gas, at constant temperature, changes from 200 ml to 500 ml, the pressure on the gas must have changed from 400 Torrs to _____.

P2 = P1V1 / V2 P2 = 400 Torr x (200ml/500ml) = 160 Torr

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760 Torr = 1 atm

760 Torr / 1 atm

1 atm/760 Torr

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