A sample of ideal gas at first expands reversibly and isothermally so that its…

CHEMISTRY · Single correct · A Level · Chemistry · Thermodynamics · Thermodynamics

Problem

A sample of ideal gas at

350\,\text{K}

first expands reversibly and isothermally so that its entropy increases by

8\,\text{J\,K}^{-1}

. It is then compressed reversibly and isothermally at the same temperature until its entropy decreases by

10\,\text{J\,K}^{-1}

. What is the net heat exchanged with the gas over the entire two-step process? (a)

+2800\,\text{J}

absorbed (b)

-700\,\text{J}

released (c)

+700\,\text{J}

absorbed (d)

-3500\,\text{J}

released