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Q. In a constant volume calorimeter, 3.5 g 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 298.0 K to 298.45 K due to the combustion process. Given that the heat capacity of the calorimeter is 2.5 kJ$\mathrm{K}^{-1}$, the numerical value for the enthalpy of combustion of the gas in kJ $\mathrm{mol}^{-1}$ is [JEE 2009]
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Sol. 9$\mathrm{q}=(2.5)(0.45)=1.125$
Q. Using the data provided, calculate the multiple bond energy $\left(\mathrm{kJ} \operatorname{mol}^{-1}\right)$ of a C C bond in $\mathrm{C}_{2} \mathrm{H}_{2}$. That energy is (take the bond energy of a C–H bond as 350 kJ $\left.\mathrm{mol}^{-1} .\right)$
(A) 1165(B) 837(C) 865(D) 815 [JEE 2012]
(A) 1165(B) 837(C) 865(D) 815 [JEE 2012]
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