Q. The heat of combustion of carbon to $CO_2$ is -393.5 kJ/mol. The heat released upon formation of 35.2 g of $CO_2$ from carbon and oxygen gas is:
A) -630 kJ
B) -3.15 kJ
C) -315 kJ
D) +315 kJ
Explanation
[Solution] $\Delta H = -393.5 \times \frac{35.2}{44} = -315$ kJ. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.