Calculate the energy required to vapourise 50g of water initially at 80oC.[specific heat capacity of water = 4.2Jg-1K-1][specific latent heat of vaporisation of water = 2260Jg-1]
A
113,000J
B
117,200J
C
234,400J
D
420,000J
Verified Correct Answer: B.
Physical Principles & Numerical Solution
mc\(\theta\) + ML = 50 x 4.2 x 20 + 50 x 2260
= 117,200J
Source: Myschool Past Questions Archive (Record #34072)