Q123 · CSIR-NET Chemistry, December 2011

Paper: CSIR-NET December 2011 · Subject: Physical Chemistry · Chapter: Thermodynamics · Topic: Laws State Functions · Marks: 2 · Difficulty: Easy

1 mol of $\mathrm{CO} 2,1 \mathrm{mol}$ of N 2 and 2 mol of O 2 were mixed at 300 K . The entropy of mixing is

(a)$6\mathrm{R}\ln 2$

(b)$8\mathrm{R}\ln 2$

(c)$8\mathrm{R}\ln 2/300$

(d)$16\mathrm{R}/\ln 2$

Answer

Answer: A ✓ checked by 4AB · confidence high

Explanation

ΔS_mix = −R Σ n_i ln x_i = −R[ln ¼ + ln ¼ + 2 ln ½] = 6R ln 2.

Study loop for Thermodynamics