Question

The enthalpy, internal energy during a process and change in volume are 500 units, 400 units, and 2 units. What is the pressure that is exerted on the gas during this process?

(a) 20 units

(b) 80 units

(c) 100 units

(d) 50 units

The question was posed to me in an interview.

This is a very interesting question from Thermodynamics topic in division Thermodynamics of Chemistry – Class 11

Answer 1

The correct answer is (d) 50 units

Explanation: We know that  ΔH = ΔU + PΔV; ΔH is the enthalpy, ΔU is the internal energy, ΔV is the change in volume and P is the pressure. So by substituting the enthalpy, internal energy during a process and change in volume as 500 units, 400 units and 2 units, we get pressure as 50 units.