List of top Chemistry Questions on Work done in Thermodynamics asked in COMEDK UGET

Which of the following is not a property of a thermodynamic system?

The enthalpies of combustion of \( H_2 \), \( C \) (graphite) and \( C_2H_6 (g) \) are \( -286.0,\; -394.0 \) and \( -1560.0 \, kJ \, mol^{-1} \) at \( 25^\circ C \) and 1 atm pressure. The enthalpy of formation of ethane is :

In the decomposition of limestone to lime, the values of \( \Delta H^\circ \) and \( \Delta S^\circ \) are \( +179.1 \, kJ \, mol^{-1} \) and \( 160.2 \, J \, K^{-1} \, mol^{-1} \). Calculate the temperature above which conversion of limestone to lime will be spontaneous, if values of \( \Delta H^\circ \) and \( \Delta S^\circ \) remain unchanged with temperature. [Assuming pressure 1 bar]

Two moles of an ideal gas at 1 bar pressure and 298 K is expanded into vacuum to double the volume. The work done is:

For a hypothetical chemical reaction \( A_2 + 3B_2 \rightarrow 2AB_3 + \text{Heat} \), which one of the following combinations of state variables would support the spontaneity of the reaction at a particular temperature?

The Enthalpy of combustion of 1.0 mole of a reactive metal X at \( 27^\circ C \) and 1.0 bar pressure to form a solid oxide (XO) is -601.83 kJ/mol. The internal energy change for this reaction is --------- kJ. \[ R = 8.314 \, \text{J K}^{-1} \text{mol}^{-1} \]