WAEC - Physics (1989 - No. 16)
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).
533000J
230000J
117200J
113000J
4200J
Explanation
Q = McΔθ + ml
Q = {50 x 4.2 x (100 - 80) + 50 x 2260} 117200J.
Q = {50 x 4.2 x (100 - 80) + 50 x 2260} 117200J.
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