Calculate the heat energy required to vapourize 50g of water initially at 80oC if the...

WAEC 1989

Calculate the heat energy required to vapourize 50g of water initially at 80^oC 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

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Correct Answer: Option C

Explanation

Q = McΔθ + ml
Q = {50 x 4.2 x (100 - 80) + 50 x 2260} 117200J.

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Calculate the heat energy required to vapourize 50g of water initially at 80oC if the...

Correct Answer: Option C

Explanation

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