Question

The bond enthalpy value for a carbon to hydrogen bond is 413 kJ. What does this mean?

A. It takes 413 kJ of energy to break a carbon to hydrogen bond.

B. The formation of a carbon to hydrogen bond releases 413 kJ of energy.

C. Both of the above

Answer 1

Breaking bond requires energy. The bond between the carbon and hydrogen is broken when the energy is absorbed. The enthalpy is defined to be the energy taken to break the one mole of the stated carbon and hydrogen bond. Thus a should be the correct answer

Answer 2

It is a I think I’m not sure