Question

If the heat of formation of `CO_(2)` is `-393` kJ. The amount of heat evolved in the formation of 0.156 kg of `CO_(2)` is
A. `-1357.9`kJ
B. `-1275.9` kJ
C. `-1572.0` kJ
D. `-1165.5` kJ

Answer 1

Correct Answer - C
Heat of formation of a substance is the heat exchanged when one mole of that substance is formed by its constituent elements.
`because` Heat evolved when 1 mole (44g) `CO_(2)` is formed
`=(393xx156)/(44)`
`therefore DeltaH` for the process = 1572 kJ =-1572.0 kJ`.