Calculate the energy required to vapourise 50g of water initially at 80 o C.[specific heat...
PHYSICS
WAEC 2002
Calculate the energy required to vapourise 50g of water initially at 80oC.[specific heat capacity of water = 2260Jg-1K-1][specific latent heat of vaporisation of water = 2260Jg-1]
- A. 113,000J
- B. 117,200J
- C. 234,400J
- D. 420,000J
Correct Answer: B. 117,200J
Explanation
mc\(\theta\) + ML = 50 x 4.2 x 20 + 50 x 2260
= 117,200J
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