Paper: CSIR-NET December 2015 · Subject: Physical Chemistry · Chapter: Thermodynamics · Topic: Thermodynamics – General · Marks: 2 · Difficulty: Medium
The temperature-dependence of the vapour pressurse of solid A can be represented by $\log p=10.0-\frac{1800}{T}$, and that of liquid A by $\log p=8.0-\frac{1400}{T}$. The temperature of the triple point of $A$ is
(a)200 K
(b)300 K
(c)400 K
(d)500 K
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
At the triple point the two vapour pressures are equal: 10.0 − 1800/T = 8.0 − 1400/T ⇒ 2 = 400/T ⇒ T = 200 K.