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Calorimetry

42. Standard ...

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42. Standard enthalpies of combustion of C2H4(g), C2H6(g) and H2(g) are –1410.8, –1559.8 and –285.9 kJ mol–1 at constant pressure and 298 K respectively. What is the enthalpy of hydrogenation of C2H4(g) at constant volume and at 298 K?

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