Work done in the reversible adiabatic process is given by:
1. 2.303 RT log (V2/V1)
2.
3. 2.303 RT log(V1/V2)
4. none of these
Determine the enthalpy change for the specified reaction:
2H2O2(l) 2H2O(l) + O2(g).
(Given the heat of formation of H2O2(l) and H2O(l) are –188 and –286 kJ/mol respectively)
1. | –196 kJ/mol | 2. | +196 kJ/mol |
3. | +948 kJ/mol | 4. | –948 kJ/mol |
One mole of a non-ideal gas undergoes a change of state (2.0 atm, 3.0 L, 95 K)(4.0 atm, 5.0 L, 245 K) with a change in internal energy, U = 30.0 L atm. The change in enthalpy (H) of the process in L atm is:
1. 40.0
2. 42.3
3. 44.0
4. not defined, because pressure is not constant
According to the law, a perfect crystal's entropy is 0 at absolute zero, which is:
1. The first law
2. Second law
3. Third law
4. None of the above
At constant pressure and temperature, the direction of any chemical reaction is one where the...... decrease.
1. Entropy
2. Enthalpy
3. Gibbs energy
4. None of the above
The work done by a mass less piston in causing an expansion V (at constant temperature), when the opposing pressure, P is variable, is given by:
1. W=
2. W=0
3. W= -PV
4. none of these
Entropy decreases during:
1. crystallization of sucrose from solution
2. rusting of iron
3. melting of ice
4. vaporization of camphor
Entropy change of vaporization at constant pressure is given by:
1.
2.
3.
4. None of the above
What is the entropy change for the reaction given below,
2H2 (g) + O2 (g) 2H2O(l)
at temperature 300 K? Standard entropies of H2 (g), O2(g) and H2O(l) are 126.6, 201.20 and 68.0 JK-1mol-1 respectively.
1. -318.4 JK-1mol-1 .
2. 318.4 JK-1mol-1
3. 31.84 JK-1mol-1
4. none of these
If S for H2, Cl2 and HCl are 0.13, 0.22 and 0.19 kJ K-1mol-1 respectively. The total change in standard entropy for the reaction, H2 + Cl2 2HCl is:
1. 30 J K-1mol-1
2. 40 J K-1mol-1
3. 60 J K-1mol-1
4. 20 J K-1mol-1