Question

When two mole of an ideal $(C_{p.m}=\frac{5}{2}R)$ heated from 300 K to 600 K at constant pressure. The change in entropy of gas $\Delta S$ is

• A. $\frac{3}{2}Rln2$
• B. $-\frac{3}{2}Rln2$
• C. $5Rln2$
• D. $\frac{5}{2}Rln2$

Answer 1

The correct option is C $5Rln2$

$\Delta S=nCp.mIn\frac{T_2}{T_1}=2\times \frac{5}{2}Rln\frac{600}{300}=5Rln2$