Question

1. A 2400 cm3 container holds 0.10 mol of helium gas at 350 ∘C .

Part A:

How much work must be done to compress the gas to 1400 cm3 at constant pressure? Express your answer to two significant figures and include the appropriate units.

Part B:

How much work must be done to compress the gas to 1400 cm3 at constant temperature? Express your answer to two significant figures and include the appropriate units.

2. A Carnot engine whose hot-reservoir temperature is 380 ∘C has a thermal efficiency of 41 %.

Part A:

By how many degrees should the temperature of the cold reservoir be decreased to raise the engine's efficiency to 58 %? Express your answer to two significant figures and include the appropriate units.

Answer 1