Question

When 1 kg of water at 373 k, is converted into steam how much amount of heat energy is required?

(a) 22600 KJ

(b) 226 KJ

(c) 2260 KJ

(d) 22.6 KJ

I have been asked this question in an interview for internship.

This interesting question is from Thermodynamics topic in portion Thermodynamics of Chemistry – Class 11

Answer 1

Right option is (c) 2260 KJ

For explanation: The latent heat of vaporization of water is 2260 KJ/Kg. The heat that is required to convert water at 373 k to steam is given by Q = mL, where m = mass of the water and L = latent heat vaporization of water; heat energy required = 1 kg x 2260 KJ/Kg = 2260 KJ.