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?

42. Standard enthalpies of combustion of C2H4(g), C2H6(g) and H2(g) ar

1.	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?
Answer» 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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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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