#### Thermodynamics Three Marks Questions

11th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 30
10 x 3 = 30
1. State the various statements of second law of thermodynamics.

2. 1 mole of an ideal gas, maintained at 4.1 atm and at a certain temperature, absorbs heat 3710 J and expands to 2 litres. Calculate the entropy change in expansion process.

3. At 33K, N2O4 is fifty percent dissociated. Calculate the standard free energy change at this temperature and at one atmosphere

4. The standard enthalpies of formation of SO2 and SO3 are -297 kJ mol-1 and -396 kJ mol-1 respectively. Calculate the standard enthalpy of reaction for the reaction: SO2 + $\frac{1}{2}$O2⟶SO3

5. For the reaction at 298 K: 2A +B ⟶ C.  ΔH = 400 J mol-1; ΔS = 0.2 JK-1 mol-1 Determine the temperature at which the reaction would be spontaneous.

6. Which law of thermodynamics deals with equivalence of different forms of energies?

7. Define work.

8. State zeroth law of thermodynamics.

9. Predict the change in internal energy for an isolated system at constant volume.

10. One mole of a gaseous system absorbs 100 J of heat and does work equivalent to 50 J. Calculate the change in the internal energy of the system.