The entropy change when two moles of an ideal monoatomic gas is heated from 200 to \( 300^{\circ...

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The entropy change when two moles of an ideal monoatomic gas is heated from 200 to \( 300^{\circ} \mathrm{C} \) reversibly and isochorically?
(a) \( \frac{3}{2} \mathrm{R} \ln \left(\frac{300}{200}\right) \)
(b) \( \frac{5}{2} \mathrm{R} \ln \left(\frac{573}{273}\right) \)
(c) \( 3 R \ln \left(\frac{573}{473}\right) \)
(d) \( \frac{3}{2} \mathrm{R} \ln \left(\frac{573}{473}\right) \)
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