0.46g of ethanol when burned raised the temperature of 50g of water by 14.3K. Calculate the heat of combustion of ethanol. [C = 12, O = 16, H = 1, Specific heat capacity of water = 4.2 jg-1K-1]

0.46g of ethanol when burned raised the temperature of 50g of water by 14.3K. Calculate the heat of combustion of ethanol.

[C = 12, O = 16, H = 1, Specific heat capacity of water = 4.2 jg^-1K^-1]

A +3000 KJ mol^-1
B +300 KJ mol^-1
C -300 KJ mol^-1
D -3000 KJ mol^-1

jamb 2000 chemistry

The correct answer is C. -300 KJ mol^-1

Heat, = -M C Q

= -50 * 4.2 * 14.3

= -300 KJ mol^-1

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