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10 April, 05:59

C (graphite) + O2 (g) → CO2 (g) + 94.05 kcal C (diamond) + O2 (g) → CO2 (g) + 94.50 kcal What could you infer from the information given above?

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  1. 10 April, 06:41
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    Looking at both reactions, we can see that the combustion of carbon, graphite or diamond, leads to the formation of carbon dioxide and energy. Since energy is a product of the reaction, we known that this is an exothermic reaction. The value of the change in enthalpy, ΔH, will be negative.

    A negative value of ΔH in each exothermic reaction suggests that the carbon dioxide product is at a lower energy than the reactants. And since more energy is released in the combustion of diamond compared to graphite, we know that diamond has a higher internal energy than graphite.
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