The mass of hydrogen to the mass of carbon in methane is always _____ in ratio.

The chemical formula of methane= CH₄

Mass of 1 hydrogen atom= 1 u

Mass of 4 hydrogen atoms= $4\times 1 \mathrm{u}= 4 \mathrm{u}$

Mass of 1 carbon atom= 12 u

The mass ratio of carbon to hydrogen in methane is = $\frac{12 \mathrm{u}}{4 \mathrm{u}}=\frac{3}{1}$

Hence, whatever the source of methane, the mass of hydrogen to the mass of carbon in methane is always 3:1 in ratio.