Assertion (A): If heat of combustion of C_2H_ | vedclass

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(D) The molar mass of $C_2H_6$ is $(2 	imes 12) + (6 	imes 1) = 30 \ g \ mol^{-1}$.Number of moles in $150 \ g$ of $C_2H_6$ is $n = \frac{150 \ g}{3

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$(A)$ is not correct but $(R)$ is correct

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(D) The molar mass of $C_2H_6$ is $(2 	imes 12) + (6 	imes 1) = 30 \ g \ mol^{-1}$.Number of moles in $150 \ g$ of $C_2H_6$ is $n = \frac{150 \ g}{30 \ g \ mol^{-1}} = 5 \ mol$.Heat liberated on combustion of $n$ moles is $n 	imes \Delta H_c$.Therefore,heat liberated = $5 	imes X \ kJ = 5X \ kJ$.Assertion $(A)$ states the heat liberated is $\frac{X}{5} \ kJ$,which is incorrect.Enthalpy is indeed an extensive property,meaning it depends on the amount of substance,which is the reason why the heat liberated is proportional to the number of moles. Thus,Reason $(R)$ is correct.

Assertion $(A)$: If heat of combustion of $C_2H_6$ is $X \ kJ \ mol^{-1}$,heat liberated on combustion of $150 \ g$ of $C_2H_6$ is $5X \ kJ$.
Reason $(R)$: Enthalpy is an extensive property.

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Assertion $(A)$: If heat of combustion of $C_2H_6$ is $X \ kJ \ mol^{-1}$,heat liberated on combustion of $150 \ g$ of $C_2H_6$ is $5X \ kJ$.Reason $(R)$: Enthalpy is an extensive property.