Question

Calculate how much heat is needed to be supplied to a gas at a pressure of 1.25 X 10^5 Pa, such that the pressure increases by 25 per cent at constant volume, and the internal energy by 120J.

Answer 1

Answer on Question #55935-Physics-Molecular Physics-Thermodynamics

Calculate how much heat is needed to be supplied to a gas at a pressure of $1.25 \times 10^{5} \mathrm{~Pa}$, such that the pressure increases by 25 per cent at constant volume, and the internal energy by 120J.

Solution

For a constant-volume process: there is no work done by the gas: $W = 0$.

The heat added to the gas is equal to the change in internal energy:

$$Q = \Delta U = 120 \mathrm{J}.$$

Answer: 120J.

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