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A gas (Molar mass = 280g/Mol) was burnt in excess O2 in a constant volume calorimeter and during combustion the temperature of the calorimeter is increased from 298 K to 298.45 K. If the heat capacity of a calorimeter is $2.5 k J K^{- 1}$ and the enthalpy of combustion of gas is $9 k J m o l^{- 1}$ then the amount of gas burnt is ______g.

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Detailed Solution

$Δ H = Δ U + 0$ (W=0 at constant volume)

X/280 moles give 2.5 x 0.45KJ
1 mole give =2.5 x 0.45 x 280 / X = 9
X = 35 g

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