# How many grams of Ne are in a neon sign that contains 0.0450 mol of neon gas?

Almost $1$ $g$.
Elemental neon has a molar mass of $20.18$ $g$ $m o {l}^{-} 1$. To get the mass, simply multiply the molar mass by the molar quantity:
$0.0450$ $m o l$ $\times$ $20.18$ $g \cdot m o {l}^{-} 1$ $=$ ??g