Calculate the heat energy required to vapourize 50g of water initially at 80oC if the specific heat capacity of water is 4.2Jg-1K (specific latent heat of vapourization of water is 2260Jg-1).
-
A.
533000J -
B.
230000J -
C.
117200J -
D.
113000J -
E.
4200J
Correct Answer: Option C
Explanation
Q = McΔθ + ml
Q = {50 x 4.2 x (100 – 80) + 50 x 2260} 117200J.