Question

The entropy change when two moles of ideal monoatomic gas is heated from 200 to 300⁰C reversibly and isochorically ?

• A. $\frac{3}{2}$R ln$\left( \frac{300}{200} \right)$
• B. $\frac{5}{2}$R ln$\left( \frac{573}{273} \right)$
• C. 3R ln$\left( \frac{573}{473} \right)$
• D. $\frac{3}{2}$ R ln$\left( \frac{573}{473} \right)$

Answer 1

Answer: (C)

3R ln$\left( \frac{573}{473} \right)$

Answer 2

$\Delta$Sgas = n CV,m ln $\frac{T_{2}}{T_{1}}$= 2 × $\frac{3}{2}$R ln $\frac{573}{473}$ = 3R ln $\left( \frac{573}{473} \right)$ .