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
Verified Correct Answer: C.
Physical Principles & Numerical Solution
Q = McΔθ + ml
Q = {50 x 4.2 x (100 - 80) + 50 x 2260} 117200J.
Source: Myschool Past Questions Archive (Record #23912)