Question

Calculate the bond energy per mole for breaking all the bonds in methane, CH4. Express your answer to four significant figures and include the appropriate units.

Answer 1

Answer: 1656j/mole

Explanation:

From the table below, bond energies can be calculated for any molecule.

C-C 347 kJ/mol

C=C 611

C-H 414

C-O 360

C=O 736

O-O 142

O=O 498

H-O 464

From the table, C-H has a bond energy of 414.

Since there are 4moles of C-H in CH4(methane);

It therefore means, 4 x 414 = 1656j/mole

Answer 2

The energy that is essential to break one C-H bond is 414 kJ/mol. Since, there are four C-H bonds in CH4, the energy Δ HCH4 for breaking all the bonds is calculated as Δ HCH4 = 4 x bond energy of C-H bond. By multiplying the 4 with the 414 kJ/mol you can get the answer of 1656 kJ/mol CH4 molecules.