Question

Why Diamond it's enthalipy is not zero

Answer 1

Answer:

Although diamond is made up of single element but every carbon atom is connected with 4 different carbons which causes it's enthalpy of formation non zero. So, ΔH°f for C (s, graphite) is zero, but the ΔH°f for C (s, diamond) is 2 kJ/mol. That is because graphite is the standard state for carbon, not diamond.

please mark me as brainlist.