The enthalpy of formation of CO2(g), H2O(l) and propene (g) are -393.5, -285.8, and 20.42 kJ mol-1 respectively. The enthalpy change for the combustion of cyclopropane at 298 K will be:
(The enthalpy of isomerization of cyclopropane to propene is -33.0 kJ mol-1. )
1. -1021.32 kJ mol-1
2. -2091.32 kJ mol-1
3. -5021.32 kJ mol-1
4. -3141.32 kJ mol-1
The enthalpies of formation of Al2O3 and Cr2O3 are – 1596 kJ and – 1134 kJ, respectively. ∆H for the reaction 2Al + Cr2O3 → 2Cr + Al2O3 is -
1. | –1365 kJ | 2. | 2730 kJ |
3. | –2730 kJ | 4. | –462 kJ |
4.8 g of C(diamond) on complete combustion evolves 1584 kJ of heat. The standard heat of the formation of gaseous carbon is 725 kJ/mol. The energy required for the given process will be:
(i)
(ii)
1. | 725, 727 | 2. | 727, 725 |
3. | 725, 723 | 4. | None of the above |