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Q.

The enthalpy of combustion of n-butane is 2658 kJ mol-1 . The amount of heat liberated when 14.5 g of this butane is completely burnt in oxygen is 

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a

2658 kJ

b

1329 kJ

c

664.5 kJ

d

332.25 kJ

answer is C.

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Detailed Solution

n-butane is C4H10 gram mol. wt.=58 g
heat liberated by 58 g = 2658 kJ
heat liberated by 14.5 g = 664.5 kj

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The enthalpy of combustion of n-butane is 2658 kJ mol-1 . The amount of heat liberated when 14.5 g of this butane is completely burnt in oxygen is