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

question 5

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

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