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Q.

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

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a

+2.0kJ

b

-1.5kJ

c

-788kJ

d

788kJ

answer is A.

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Detailed Solution

C (graphite) ⟶C (diamond) ΔH=395−393=2KJ
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Given :C(diamond) +O2→ CO2,; ∆H =-395KJC(graphite) + O2→CO2;∆H= 393KJThe enthalpy of formation of diamond from graphite is