An ideal gas (the system) is contained in a flexible balloon at a pressure of 1 atm and is initially at a temperature of 20.°C. The surrounding air is at the same pressure, but its temperature is 25°C. When the system has equilibrated with its surroundings, both system and surroundings are at 25°C and 1 atm. In changing from the initial to the final state, which one of the following relationships regarding the system is correct? A) ΔU 0 E) q 0

Question

An ideal gas (the system) is contained in a flexible balloon at a pressure of 1 atm and is initially at a temperature of 20.°C. The surrounding air is at the same pressure, but its temperature is 25°C. When the system has equilibrated with its surroundings, both system and surroundings are at 25°C and 1 atm. In changing from the initial to the final state, which one of the following relationships regarding the system is correct?
A) ΔU < 0
B) ΔU = 0
C) ΔH = 0
D) w > 0
E) q > 0

Quizplus · Accepted Answer

The system absorbs heat (q > 0) from the surroundings to increase its temperature from 20°C to 25°C, leading to thermal equilibrium.

An Ideal Gas (The System) Is Contained in a Flexible