CBSE Class 11-science Answered
Enthalpy of combustion of carbon graphite and carbon diamond is -293.5(kJ/mol) and - 670(kJ/mol) respectively. Calculate conversion of graphite into diamond.
Asked by Topperlearning User | 14 Aug, 2014, 09:58: AM
Expert Answer
Aim equation: C (graphite) → C (diamond)
Given;
Graphite C (graphite) + O2(g) → CO2(g) 
= -290.5 (kJ/mol) ----1
= -290.5 (kJ/mol) ----1Diamond C (diamond) + O2(g) → CO2(g) = -670.5 (kJ/mol) ----2
= -670.5 (kJ/mol) ----2Subtract 2 from 1
C (graphite) → C (diamond) ∆H = + 380(kJ/mol)
Answered by | 14 Aug, 2014, 11:58: AM
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