Question

A container contains $0.25kg$ of a liquid at its boiling temperature.
If the latent heat of fusion for the liquid is $500Joules/kg$ and the latent heat of vaporization for the liquid is $1000Joules/kg$, 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

Answer: (E)

$250J$

Given : $m=0.25$ kg $L_v=1000$ $J/kg$

$\therefore$ Heat required to boil all the liquid $Q=m{L}_v=0.25\times 1000=250$ $J$