1) CGraphite + O2(g) →CO2(g);ΔH = -94 K.Cals2) CDiamond + O2(g) → CO2(g);ΔH = -94.5 K.CalsFrom the above data the heat of transition of Cdiamond → CGraphite

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answer is 3.

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Detailed Solution

1) CGraphite + O2(g) →CO2(g);ΔH1 = -94 K.Cals2) CDiamond + O2(g) → CO2(g);ΔH2 = -94.5 K.CalsSubstract equation (1) from eqation(2)

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