Chemical Thermodynamics Mock Tests

The enthalpy of formation of NH₃ is −46.0 kJ mol⁻¹. If the enthalpy of formation of N₂ from its atoms is +946 kJ mol⁻¹ and that of H₂ is +436 kJ mol⁻¹, the average bond enthalpy of N−H bond is:

For a reaction to be spontaneous at all temperatures, which of the following conditions must be met?

For a reaction, ΔH = -54.07 kJ mol⁻¹ and ΔS = 10 J K⁻¹ mol⁻¹ at 298 K. The value of ΔG is closest to:

The entropy change for the reaction N2(g) + 3H2(g) -> 2NH3(g) is:

The correct order of acidic strength among the following oxides is:

The standard enthalpy of formation of NH3(g) is -46.0 kJ/mol. What is the enthalpy change when 3.4 g of NH3 is completely decomposed into its elements? (Molar mass of NH3 = 17 g/mol)

The enthalpy of combustion of carbon to CO₂ is -393.5 kJ mol⁻¹. The mass of carbon required to produce 1570 kJ of heat at STP is:

For a reaction, Delta H = -10 kJ mol⁻¹ and Delta S = -50 J K⁻¹ mol⁻¹. At what temperature will the reaction be at equilibrium? (Delta G = 0)