Question on: JAMB Chemistry - 2000
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]
[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
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Correct Option: C
Heat, = -M C Q
= -50 * 4.2 * 14.3
= -300 KJ mol-1
= -50 * 4.2 * 14.3
= -300 KJ mol-1
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