# What would be the mass of four moles of methane?

Approx. $64 \cdot g$.
The molar mass of methane is $16.0 \cdot g \cdot m o {l}^{-} 1$.
$4 \cdot \cancel{m o l} \times 16.0 \cdot g \cdot \cancel{m o {l}^{-} 1}$ $=$ ?? g?