If water vapour is assumed to be a perfect gas, molar enthalpy change for vapourisation of 1 mol of water at 1 bar and 100°C is 41kJ mol–1. The internal energy change, when 1 mol of water is vapourised at 1 bar pressure and 100°C is:
1. 35.5 kJ mol–1
2. 37.9 kJ mol–1
3. 41 kJ mol–1
4. 44.2 kJ mol–1
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1g of graphite is burnt in a bomb calorimeter in excess of oxygen at 298 K and 1 atmospheric pressure according to the equation
C (graphite) + O2(g) → CO2(g)
During the reaction, the temperature rises from 298 K to 299 K. If the heat capacity of the bomb calorimeter is 20.7kJ/K, the enthalpy change for the above reaction at 298 K and 1 atm is-
1. | – 2.48 ×102 kJ mol–1 | 2. | – 3.45 ×102 kJ mol–1 |
3. | – 1.65 ×102 kJ mol–1 | 4. | – 1.88 ×102 kJ mol–1 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA swimmer coming out from a pool is covered with a film of water weighing about 18g. The internal energy of vaporization at 298K. is-
∆vap H⊖ for water at 298K= 44.01kJ mol–1
1. 38.63 kJ
2. 43.82 J
3. 41.53 kJ
4. 40.33 J
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology