Explore topic-wise MCQs in Chemistry Questions and Answers.

This section includes 2 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.

1.

Calculate the carbon carbon double bond energy in ethane from the following reaction, H2C=CH2(g) + H2(g) –> H3C−CH3(g) ΔH = −138 kJ/mol. If Bond enthalpies are: C−C = 348; H−H = 436; C−H = 412 in KJ/mol.

A. 498 KJ/mol
B. 593 KJ/mol
C. 508 KJ/mol
D. 598 KJ/mol
Answer» E.
Discussion
2.

Calculate the heat of combustion of ethane, in the reaction C2H6(g) + 3 1/2O2(g) → 2CO2(g) + 3H2O(l) where the heats of formation of ethane gas, carbon dioxide gas and water liquid are –84.7 kJ mol-1, -393.5 kJ mol-1 and –285.8 kJ mol-1 respectively.

A. -1559.7 kJ mol-1
B. -155.7 kJ mol-1
C. -159.7 kJ mol-1
D. -559.7 kJ mol-1
Answer» B. -155.7 kJ mol-1
Discussion