Question

The percentage composition of carbon by a mole in methane is ______.

Options

• 75%

• 80%

• 25%

• 20%

Answer 1

The percentage composition of carbon by a mole in methane is 20%.

Explanation:

Mole % of 'C' in CH4 (methane) = `("mole of C")/("mole of C+ mole of hydrogen") xx 100`

Methane has one atom of carbon among 5 atom that is 1 carbon and 4 Hydrogen 

% by mole of carbon = `("1 mole of atom")/("5 mole of atom") xx 100 = 0.2 xx 100 = 20%`

The percentage composition is the percentage by mass of each element in a compound.