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Grade 11IIT JEE Entrance Exam

enthalpy of combustion of diamond and graphite are -395 and -393 kj .find the heat of formation of diamond from graphite

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7 Years agoGrade 11
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1 Answer

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ApprovedApproved Tutor Answer7 Years ago
Aim equation: C (graphite) → C (diamond)
Given;
Graphite C (graphite) + O2(g) → CO2(g)             
= -393  (kJ/mol)  ----1
Diamond C (diamond) + O2(g) → CO2(g)            
= -395  (kJ/mol)  ----2
Subtract 2 from 1

C (graphite) → C (diamond)                                ∆H = + 2(kJ/mol)

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