Q. 48 g of C (diamond) on complete combustion evolves 1584 kJ of heat. The standard heat of formation of gaseous carbon is 725 kJ/mol. The energies required for the process (i)C (graphite) $\rightarrow$ C(gas) (ii)C (diamond) $\rightarrow$ C(gas)are:

A) 725, 727
B) 717, 725
C) 725, 723
D) None of these
Explanation

(c)
As graphite is thermodynamically more stable than diamond hence, more heat is required to convert graphite to gaseous carbon

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.