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4.0 g of a gas occupies 22.4 litres at N...

`4.0 g` of a gas occupies `22.4` litres at NTP. The specific heat capacity of the gas at constant volume is `5.0 JK^(-1)mol^(-1)`. If the speed of sound in this gas at NTP is `952 ms^(-1)`. Then the heat capacity at constant pressure is

A

`8.5 JK^-1 mol^-1`

B

`8.0 JK^-1 mol^-1`

C

`7.5 JK^-1 mol^-1`

D

`7.0 JK^-1 mol^-1`

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