106J of heat is required to boil off completely 2kg of a certain liquid. Neglecting...

JAMB 2005

10⁶J of heat is required to boil off completely 2kg of a certain liquid. Neglecting heat lost to the surroundings, the latent heat of vaporization of the liquid is

A. 2.0 x 10⁶J kg^-1
B. 5.0 x 10⁶J kg^-1
C. 2.0 x 10⁵J kg^-1
D. 5.0 x 10⁵J kg^-1

Your School's Whatsapp Group - Join Us now

Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts

Correct Answer: Option D

Explanation

From the heat exchange involved, the latent heat of vaporization, L can be deduced from the relation:
ML = 10⁶, where M = mass of the liquid.
∴ 2 x L = 10⁶
=> L = ^10⁶/₂ = 5.0 x 10⁵J kg^-1

There is an explanation video available below.

Previous Next

Go back to Phy classroom

Report an Error Ask A Question Download App