Heat of combustion for C(s), H2(g) and CH4(g) are -94, -68 and -213 kcal/mol. Then, for
C(s) + 2H2(g) CH4(g) is
1. -17 kcal/mol
2. -111 kcal/mol
3. -170 kcal/mol
4. -85 kcal/mol
Heat of the neutralization is greater than 13.7 kcal in -
1. HF & NH4OH
2. HCl & NaOH
3. HI & KOH
4. HF & NaOH
If (C2H4) and (C2H6) are x1 and x2 kcal/mol then heat of hydrogenation of C2H4 is :-
(1) x1 + x2
(2) x1 - x2
(3) x2 - x1
(4) x1 + 2x2
One mole of methanol when burnt in O2 gives out 723 kJ mol-1 heat. If one mole of O2 is used, what will be the amount of heat evolved?
1. 482 kJ
2. 241 kJ
3. 723 kJ
4. 924 kJ
The heat of combustion of carbon to CO2 is -393.5 kJ/mol. The heat released upon the
formation of 35.2 g of CO2 from carbon and oxygen gas is
1. -315 kJ
2. +315 kJ
3. -630 kJ
4. -3.15 kJ
Enthalpy change for the reaction,
4H(g) 2H2(g) is -869.6 kJ
The dissociation energy of H-H bond is
1. -869.6 kJ
2. + 434.8 kJ
3. +217.4 kJ
4. -434.8 kJ
The enthalpy of combustion of H2, cyclohexene (C6H10) and cyclohexane (C6H12) are -241, -3800 and -3920 kJ per mol respectively. Heat of hydrogenation of cyclohexene is:
(a) -121 kJ per mol
(b) +121 kJ per mol
(c) +242 kJ per mol
(d) -242 kJ per mol
The heat produced in calories by the combustion of one gram of carbon is called
1. Heat of combustion of carbon
2. Heat of formation of carbon
3. Calorific value of carbon
4. Heat of production of carbon
ΔE° of combustion of isobutylene is –X kJ mol–1. The value of ΔH° is [DCE 2004]
1. = ΔE°
2. > ΔE°
3. = 0
4. < ΔE°
The standard entropies of CO2(g), C(s) and O2(g) are 213.5, 5.690 and 205 JK–1 respectively. The standard entropy of formation of CO2(g) is
(1) 1.86 JK–1
(2) 1.96 JK–1
(3) 2.81 JK–1
(4) 2.86 JK–1