Question

CP-T curve of CO2 forms a rectangle of height 10 J/^oC from 5^oC to 10^oC?

(a) 10 J

(b) 50 J

(c) 100 J

(d) 250 J

I had been asked this question during an interview.

My doubt stems from Heat Capacity Equations in section Introduction to Energy Balances for Processes without Reaction and Calculation of Enthalpy Changes of Basic Chemical Engineering

Answer 1

The correct option is (b) 50 J

To elaborate: Enthalpy change is the area covered under CP-T curve = Area of rectangle = 10*(10 – 5) = 50 J.