One mole of an ideal diatomic gas \( \left(\mathrm{C}_{\mathrm{V}}=5 \mathrm{cal}\right) \) was ....
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One mole of an ideal diatomic gas \( \left(\mathrm{C}_{\mathrm{V}}=5 \mathrm{cal}\right) \) was transformed from initial \( 25^{\circ} \mathrm{C} \) and \( 1 \mathrm{~L} \) to the state
\( \mathrm{P} \)
when temperature is \( 100^{\circ} \mathrm{C} \) and volume \( 10 \mathrm{~L} \). The entropy change of the process can be expressed as \( (\mathrm{R}=2 \) calories \( / \mathrm{mol} / \mathrm{K}) \) :
(1) \( 3 \ln \frac{298}{373}+2 \ln 10 \)
(2) \( 5 \ln \frac{373}{298}+2 \ln 10 \)
(3) \( 7 \ln \frac{373}{298}+2 \ln \frac{1}{10} \)
(4) \( 5 \ln \frac{373}{298}+2 \ln \frac{1}{10} \)
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