The Standard Enthalpy of Formation of Methane, CH₄, Is -75

Multiple Choice

The standard enthalpy of formation of methane, CH₄, is -75 kJ mol^-1 at 298.15 K. Calculate the mean bond enthalpy of a H-CH₃ bond, given that, at this temperature, the standard enthalpy of atomization of carbon
C(s, graphite)  C(g)
Is +717 kJ mol^-1 and the standard bond enthalpy of hydrogen, H₂, is 436 kJ mol^-1.

A) +1664 kJ mol^-1
B) +1078 kJ mol^-1
C) +379 kJ mol^-1
D) +416 kJ mol^-1