The entropy change when $2 \, \text{moles}$ of an ideal monoatomic gas is heated from $200 \, ^\circ \text{C}$ to $300 \, ^\circ \text{C}$ isochorically is:
- A$\frac{3}{2} R \ln \left( \frac{300}{200} \right)$
- B$\frac{5}{2} R \ln \left( \frac{573}{273} \right)$
- C$3 R \ln \left( \frac{573}{473} \right)$
- D$\frac{3}{2} R \ln \left( \frac{573}{473} \right)$
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