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In a constant volume calorimeter 5g of a...

In a constant volume calorimeter 5g of a gas with molecular weight 40 was burnt in excess of oxygen at 298 K.the temperature of the calorimeter was found to increase from 298 K to 298.75 K due to combustion process.Given that the heat capacity of the calorimeter is 2.5 `kJ K^(-1)`,a numerical value for the `DeltaU` of combustion of the gas in `kJ mol^(-1)` is

A

15

B

12

C

90

D

8

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The correct Answer is:
A
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