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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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  • In a constant volume calorimeter, 3.5g of a gas with molecular weight 28 was burnt in excess oxygen at 298.0 K. The temperature of the calorimeter was found to increase from 298 K to 298 K due to the combustion process. Given that the combustion process. Given that the heat capacituy of the calorimeter is 2.5 J K^(-1) , the value for the enthalpy of combustion of the gas id

    A
    `90 kJ mol^(-1)`
    B
    `9 kJ mol^(-1)`
    C
    `18 kJ mol^(-1)`
    D
    `6 kJ mol^(-1)`

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