The mean bond enthalpy for the C - H bond is 412 kJ mol-1. Εstimate the standard enthalpy of methane, gas.
ΔHf0[C,g] = 717 kJ mol-1 and ΔH[H-H] = 436 kJ mol-1.
Standard enthalpy?
Well simply, Methane gas (CH4) has four C-H bonds. If there is 412 kJ of energy in each, there is 412 x 4 over all. (1648 kJ mol-1)
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