# How many moles of helium are present in a 5 L container at STP?

The molar volume of an ideal gas at STP is $22.4 \cdot L$.
${n}_{\text{He}}$ $=$ $\text{Volume"/"Molar volume}$ $=$ $\frac{5.0 \cdot L}{22.4 \cdot L \cdot m o {l}^{-} 1}$ $=$ ??mol