0.3 g of ethane undergoes combustion at 27°C in a bomb calorimeter. The temperature of calorimeter system (including the water) is found to rise by 0.5°C. The heat evolved during combustion of ethane at constant pressure is ______ kJ . (Nearest integer) [

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Solution

Q.
0.3 g of ethane undergoes combustion at 27°C in a bomb calorimeter. The temperature of calorimeter system (including the water) is found to rise by 0.5°C. The heat evolved during combustion of ethane at constant pressure is ______ kJ ${mol}^{- 1}$ . (Nearest integer) [Given: The heat capacity of the calorimeter system is 20 kJ $K^{- 1}$ , R = 8.3 J $K^{- 1}$ ${mol}^{- 1}$ ]. Assume ideal gas behaviour. Atomic mass of C and H are 12 and 1 g ${mol}^{- 1}$ respectively] [2023]

Ans.
(1006)

Moles of ethane = 0.01

$Q = C Δ T = - 1000 kJ/mol$

$Δ H = Δ E + Δ n_{g} R T$

$Δ n_{g} = - \frac{5}{2}$

$Δ H = - 1006 kJ/mol$

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