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0.46g of ethanol when burned raised the temperature of 50g of water by 14.3K. Ca...


Question

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]

Options

A) +3000 KJ mol-1

B) +300 KJ mol-1

C) -300 KJ mol-1

D) -3000 KJ mol-1


The correct answer is C.

Explanation:

Heat, = -M C Q
= -50 * 4.2 * 14.3
= -300 KJ mol-1

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