Answer
There is a total of 0.179 mole of $CO_2$ in 4.00 L of $CO_2$ gas.
Work Step by Step
1. Setup the conversion factors:
For a gas at STP conditions, we can use the equality: $1 \space mole = 22.4 \space L$:
$\frac{1 \space mole}{22.4 \space L}$ and $\frac{22.4 \space L}{1 \space mole}$
2. Calculate the number of moles of $CO_2$:
$4.00 \space L \times \frac{1 \space mole}{22.4 \space L} = 0.179 \space mole$
