Question

What is the total energy required to break all the bonds in 1 mol propanol,
C3H8O?

Answer 1

The total energy required to break all the bonds in 1 mol of propanol is -68.5 kJ/mol.

Step-by-step explanation:

The total energy required to break all the bonds in 1 mol of propanol, C3H8O, can be calculated by summing the bond energies on the reactants side and subtracting the bond energies on the products side. The bond energies are given as follows:

• 4 C-H bonds: 415 kJ/mol
• 2 H-H bonds: 872.8 kJ/mol
• 1 O=O bond: 498.7 kJ/mol

To calculate the total energy required for bond breaking, we sum the energy of all the bonds broken on the reactants side and subtract the energy of all the bonds formed on the products side. Therefore, the total energy required to break all the bonds in 1 mol of propanol is (4 x 415) - (2 x 872.8) - 498.7 = -68.5 kJ/mol.

Answer 2

The total energy to break all the bonds in 1 mole of 1-propanol, C₃H₈O, is 4411 kJ/mol

Step-by-step explanation:

We note that propanol, C₃H₈O is also known as 1-propanol is written as follows;

CH₃CH₂CH₂OH which gives

CH₃-CH₂-CH₂-OH

Hence, the total number of bonds are;

C-H Bonds = 3 + 2 + 2 = 7

C-O Bonds = 1

O-H Bond = 1

C-C Bonds = 2

The bond energies are as follows;

C-H Bonds = 413 kJ/mol

C-O Bonds = 358 kJ/mol

O-H Bond = 468 kJ/mol

C-C Bonds = 347 kJ/mol

Energy required to break the bonds in 1-propanol is therefore;

C-H Bonds = 413 kJ/mol × 7 = 2,891 kJ/mol

C-O Bonds = 358 kJ/mol × 1 = 358 kJ/mol

O-H Bond = 468 kJ/mol × 1 = 468 kJ/mol

C-C Bonds = 347 kJ/mol × 2 = 694 kJ/mol

The total energy to break all the bonds in 1 mole of 1-propanol = 4411 kJ/mol.