Question

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

• A. $\frac{3}{2}$R ln 2
• B. –R$\frac{3}{2}$ln 2
• C. 5R ln 2
• D. $\frac{5}{2}$R ln 2

Answer 1

Answer: (C)

5R ln 2

Answer 2

$\Delta$S = nCp, m In $\frac{T_{2}}{T_{1}}$ = 2 × $\frac{5}{2}$R In $\frac{600}{300}$ = 5 R In 2