List of top Chemistry Questions on Thermodynamics

X is an extensive property and x is an intensive property of a thermodynamic system. Which of the following statement(s) is (are) correct?

Adiabatic free expansion of an ideal gas must be: \} \begin{tabular}{ll} (A) Isobaric & (B) Isochoric
(C) Isothermal & (D) Isoentropic
\end{tabular}

The standard heat of formation, in kcal/mol, of $Ba^{2+}$ is:
Given: Standard heat of formation of SO₄²⁻(aq) = -216 kcal/mol, standard heat of crystallization of BaSO₄(s) = -4.5 kcal/mol, standard heat of formation of BaSO₄(s) = -349 kcal/mol.

The enthalpy change for the reaction $ \text{C}_2\text{H}_4 (\text{g}) + 3\text{O}_2 (\text{g}) \rightarrow 2\text{CO}_2 (\text{g}) + 2\text{H}_2\text{O} (\text{l}) $ is $ -1410 \, \text{kJ/mol} $. If the standard enthalpies of formation of $ \text{CO}_2 (\text{g}) $ and $ \text{H}_2\text{O} (\text{l}) $ are $ -393.5 \, \text{kJ/mol} $ and $ -286 \, \text{kJ/mol} $ respectively, what is the standard enthalpy of formation of $ \text{C}_2\text{H}_4 (\text{g}) $?

The enthalpy of formation of hydrogen chloride (HCl) is $ -92.3 \, \text{kJ/mol} $. If 2 moles of HCl are formed from hydrogen and chlorine gas, calculate the total heat released.

What is the enthalpy change ($ \Delta H $) for an exothermic reaction?

For the reaction: $ \text{N}_2(g) + 3\text{H}_2(g) \rightarrow 2\text{NH}_3(g) $, the enthalpy change ($ \Delta H $) is –92.4 kJ/mol. What type of reaction is it?

Match List I with List II

List-I (Process)		List-II (Conditions)
(A)	Isothermal process	(I)	No heat exchange
(B)	Isochoric process	(II)	Carried out at constant temperature
(C)	Isobaric process	(III)	Carried out at constant volume
(D)	Adiabatic process	(IV)	Carried out at constant pressure

Choose the correct answer from the options given below:

If the activation energy for the forward reaction is $ 150 \, \text{kJ/mol} $ and that of the reverse reaction is $ 260 \, \text{kJ/mol} $, what is the enthalpy change for the reaction?