Heat of Combustion Objectives Types Questions and Answers  

1. What is the heating value of 10 Kg of coal with heat of combustion 10 J/Kg?

a) -10 J

b) 10 J

c) -100 J

d) 100 J

Answer: -100 J

2. What is the difference between lower heating value and higher heating value if the product has 2 moles of H2O and Enthalpy of vaporization is 40 J/mole at standard conditions?

a) -40 J

b) 40 J

c) -80 J

d) 80 J

Answer: -80 J

3. What is the heating value of 2 Kg of coal with heat of combustion 15 J/Kg?

a) -15 J

b) 15 J

c) -30 J

d) 30 J

Answer: -30 J

4. What is the heat of reaction for N2 + 3H2 -> 2NH3, if the heat of combustion of N2 = 5 J, H2 = 2 J, and NH3 = 15 J?

a) -5 J

b) 5 J

c) -19 J

d) 19 J

Answer: -19 J

5. What is the heat of reaction if the heat of combustion of products is 40 J and heat of combustion of reactants is 25 J?

a) 5 J

b) 10 J

c) 15 J

d) -15 J

Answer: -15 J

6. What is the heat of reaction if the heat of combustion of products is 25 J and heat of combustion of reactants is 15 J?

a) -5 J

b) 5 J

c) -10 J

d) 10 J

Answer: -10 J

7. What is the heat of reaction for H2 + Cl2 -> 2HCl, if the heat of combustion of H2 = 2 J, Cl2 = 10 J, and HCl = 10 J?

a) -8 J

b) 8 J

c) -10 J

d) 10 J

Answer: -8 J

8. What is the heat of reaction if the heat of combustion of products is 10 J and heat of combustion of reactants is 5 J?

a) -5 J

b) 5 J

c) 10 J

d) Cannot be determined

Answer: -5 J

9. What is the heat of reaction if the heat of combustion of products is 10 J and heat of combustion of reactants is 15 J?

a) -5 J

b) 5 J

c) 10 J

d) Cannot say

Answer: 5 J

10. What is the heat of reaction for CH4 + 2O2 -> CO2 + 2H2O, if the heat of combustion of H2O = 5 J, CO2 = 10 J, O2 = 0, and CH4 = 25 J?

a) -5 J

b) 5 J

c) -10 J

d) 10 J

Answer: 5 J

11. What is the heat of reaction if the heat of combustion of products is 2 J and heat of combustion of reactants is 10 J?

a) 8 J

b) -8 J

c) 4 J

d) -4 J

Answer: 8 J

12. What is the heat of reaction for C6H6 + 3H2 -> C6H12, if the heat of combustion of H2 = 2 J, C6H6= 30 J, and C6H12 = 25 J?

a) -6 J

b) 6 J

c) -11 J

d) 11 J

Answer: 11 J

13. What is the heat of reaction for 2CO + O2 -> 2CO2, if the heat of combustion of CO = 20 J, O2 = 5 J, and CO2 = 25 J?

a) 5 J

b) -5 J

c) 15 J

d) -15 J

Answer: 15 J

14. What is the value of higher heating value if the value of lower heating value is 10 J and the product has 5 moles of H2O and Enthalpy of vaporization is 4 J/mole at standard conditions?

a) 10 J

b) 20 J

c) 30 J

d) 40 J

Answer: 30 J

15. What is the difference between higher heating value and lower heating value if the product has 5 moles of H2O and Enthalpy of vaporization is 10 J/mole at standard conditions?

a) 10 J

b) -10 J

c) 50 J

d) -50 J

Answer: 50 J