## College Physics (4th Edition)

There are 9.02 moles of $CH_4$ in 144.36 grams of $CH_4$.
A carbon atom consists of 6 protons and 6 neutrons. A hydrogen atom consists of 1 proton. The mass of one methane $CH_4$ molecule is $16~u$ We know that 1 mole of methane has a mass of $16~g$. We can find the number of moles in $144.36~g$ of methane: $\frac{144.36~g}{16~g/mol} = 9.02~mol$ There are 9.02 moles of $CH_4$ in 144.36 grams of $CH_4$.