Question

A container contains $0.25$ kg of a liquid at its boiling temperature. If the latent heat of fusion for the liquid is $500$ Joules/ kg and the latent heat of vaporization for the liquid is $1000$ Joules/ Kg. How much heat must be added to the liquid to boil all of the liquid away?

• A. $125J$
• B. $2000J$
• C. $4000J$
• D. $0.50J$
• E. $250J$

Answer 1

The correct option is E $250J$

Mass of liquid to be boiled $m=0.25kg$

Latent heat of vaporization of liquid $H_v=1000$ $J/kg$

Thus heat required to boil the liquid $Q=m{H}_v=0.25\times 1000=250J$