The average strength of a hydrogen bond is approximately what percent of the average strength of a covalent bond?

a. 50 %

b. 10 %

c. 5 %

d. 100 %

Hydrogen bonds are approximately 5% of the bond strength of covalent bonds, for example (C-C or C-H bonds).

Hydrogen bonds strength in water is approximately 20 kJ/mol, strenght of carbon-carbon bond is approximately 350 kJ/mol and strengh of carbon-hydrogen bond is approximately 340 kJ/mol.

20 kJ/350 kJ = 0,057 = 5,7 %.