A 220.0-mL sample of helium gas is in a cylinder with a movable piston at 105 kPa and 275 K. The piston is pushed in until the sample has a volume of 95.0 mL. The new temperature of the gas is 310. K. What is the new pressure of the sample? (1) 5l. 1 kPa (2) 216 kPa (3) 243 kPa (4) 274 kPa

Question

Chemistry

Joselyn Yu

20 April, 05:52

A 220.0-mL sample of helium gas is in a cylinder with a movable piston at 105 kPa and 275 K. The piston is pushed in until the sample has a volume of 95.0 mL. The new temperature of the gas is 310. K. What is the new pressure of the sample? (1) 5l. 1 kPa (2) 216 kPa (3) 243 kPa (4) 274 kPa

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Remington Pearson · Answer 1

4. This problem is really simple if you realize that you can use the combined gas law:

P1V1/T1 = P2V2/T2

Therefore, just substitute in and solve:

(105 kPa) (220.0 mL) / (275K) = ? kPa (95.0 mL) / (310 K)

Solve for?

Answer is 274. kPa