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**Gas Laws Practice Problems**

P1V1T2 = P2V2T1 Gas Laws Practice Problems 1) Work out each problem on scratch paper. 2) Click ANSWER to check your answer. 3) Click NEXT to go on to the next problem. CLICK TO START C. Johannesson

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QUESTION #1 Helium occupies 3.8 L at -45°C. What volume will it occupy at 45°C? ANSWER C. Johannesson

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**V2 = 5.3 L ANSWER #1 CHARLES’ LAW P1V1T2 = P2V2T1 V1 = 3.8 L**

T1 = -45°C = 228 K V2 = ? T2 = 45°C = 318 K CHARLES’ LAW P1V1T2 = P2V2T1 V2 = 5.3 L BACK TO PROBLEM NEXT C. Johannesson

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QUESTION #2 Ammonia gas occupies a volume of 450. mL at 720. mm Hg. What volume will it occupy at standard pressure? ANSWER C. Johannesson

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**V2 = 426 mL ANSWER #2 BOYLE’S LAW P1V1T2 = P2V2T1 V1 = 450. mL**

P1 = 720. mm Hg V2 = ? P2 = 760. mm Hg BOYLE’S LAW P1V1T2 = P2V2T1 V2 = 426 mL BACK TO PROBLEM NEXT C. Johannesson

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QUESTION #3 A gas at STP is cooled to -185°C. What pressure in atmospheres will it have at this temperature (volume remains constant)? ANSWER C. Johannesson

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**P2 = 0.32 atm ANSWER #3 GAY-LUSSAC’S LAW P1V1T2 = P2V2T1 P1 = 1 atm**

T1 = 273 K P2 = ? T2 = -185°C = 88 K GAY-LUSSAC’S LAW P1V1T2 = P2V2T1 P2 = 0.32 atm BACK TO PROBLEM NEXT C. Johannesson

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QUESTION #4 A gas occupies 1.5 L at 850 mm Hg and 15°C. At what pressure will this gas occupy 2.5 L at 30.0°C? ANSWER C. Johannesson

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**P2 = 540 mm Hg ANSWER #4 COMBINED GAS LAW P1V1T2 = P2V2T1 V1 = 1.5 L**

T1 = 15°C = 288 K P2 = ? V2 = 2.5 L T2 = 30.0°C = 303 K COMBINED GAS LAW P1V1T2 = P2V2T1 P2 = 540 mm Hg BACK TO PROBLEM NEXT C. Johannesson

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QUESTION #5 Chlorine gas has a pressure of 1.05 atm at 25°C. What pressure will it exert at 75°C? ANSWER C. Johannesson

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**P2 = 1.23 atm ANSWER #5 GAY-LUSSAC’S LAW P1V1T2 = P2V2T1 P1 = 1.05 atm**

T1 = 25°C = 298 K P2 = ? T2 = 75°C = 348 K GAY-LUSSAC’S LAW P1V1T2 = P2V2T1 P2 = 1.23 atm BACK TO PROBLEM NEXT C. Johannesson

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QUESTION #6 A gas occupies 256 mL at 720 torr and 25°C. What will its volume be at STP? ANSWER C. Johannesson

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**V2 = 220 mL ANSWER #6 COMBINED GAS LAW P1V1T2 = P2V2T1 V1 = 256 mL**

P1 = 720 torr T1 = 25°C = 298 K V2 = ? P2 = 760. torr T2 = 273 K COMBINED GAS LAW P1V1T2 = P2V2T1 V2 = 220 mL BACK TO PROBLEM NEXT C. Johannesson

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QUESTION #7 At 27°C, fluorine occupies a volume of dm3. To what temperature in degrees Celsius should it be lowered to bring the volume to 200. mL? ANSWER C. Johannesson

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**T2 = -153°C (120 K) ANSWER #7 CHARLES’ LAW P1V1T2 = P2V2T1**

V1 = dm3 T2 = ?°C V2 = 200. mL = dm3 CHARLES’ LAW P1V1T2 = P2V2T1 T2 = -153°C (120 K) BACK TO PROBLEM NEXT C. Johannesson

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QUESTION #8 A gas occupies 125 mL at 125 kPa. After being heated to 75°C and depressurized to kPa, it occupies L. What was the original temperature of the gas? ANSWER C. Johannesson

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**T1 = 544 K (271°C) ANSWER #8 COMBINED GAS LAW P1V1T2 = P2V2T1**

V1 = 125 mL P1 = 125 kPa T2 = 75°C = 348 K P2 = kPa V2 = L = 100. mL T1 = ? COMBINED GAS LAW P1V1T2 = P2V2T1 T1 = 544 K (271°C) BACK TO PROBLEM NEXT C. Johannesson

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QUESTION #9 A 3.2-L sample of gas has a pressure of 102 kPa. If the volume is reduced to 0.65 L, what pressure will the gas exert? ANSWER C. Johannesson

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**P2 = 502 kPa ANSWER #9 BOYLE’S LAW P1V1T2 = P2V2T1 V1 = 3.2 L**

BACK TO PROBLEM NEXT C. Johannesson

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QUESTION #10 A gas at 2.5 atm and 25°C expands to 750 mL after being cooled to 0.0°C and depressurized to 122 kPa. What was the original volume of the gas? ANSWER C. Johannesson

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**V1 = 390 mL ANSWER #10 COMBINED GAS LAW P1V1T2 = P2V2T1 P1 = 2.5 atm**

T1 = 25°C = 298 K V2 = 750 mL T2 = 0.0°C = 273 K P2 = 122 kPa = 1.20 atm V1 = ? COMBINED GAS LAW P1V1T2 = P2V2T1 V1 = 390 mL BACK TO PROBLEM EXIT C. Johannesson

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