First slide

Enthalpy of formation

Question

Given :
C(diamond) +O₂→ CO₂,; $∆$ H =-395KJ
C(graphite) + O₂→CO₂; $∆$ H= 393KJ
The enthalpy of formation of diamond from graphite is

Easy

A

+2.0kJ
B

-1.5kJ
C

-788kJ
D

788kJ

Solution

$\begin{array}{l} C (graphite) ⟶ C (diamond) \\ ΔH = 395 - 393 = 2 KJ \end{array}$

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