Question: A gas is inside a cylinder fitted with a piston. The gas and its surroundings are both at (20^{circ} mathrm{C}), and the gas is compressed

A gas is inside a cylinder fitted with a piston. The gas and its surroundings are both at $20^{\circ} \mathrm{C}$, and the gas is compressed as the piston moves and decreases the cylinder volume. The compression takes place slowly enough to allow the gas temperature to stay at $20^{\circ} \mathrm{C}$, and the work done on the gas by the compression is $2.0 \times 10^{3} \mathrm{~J}$. What is the change in entropy of the gas?

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