# Question #1a3be

Use the ideal gas law $P V = n R T$ and solve for $n$
$n = \frac{P V}{R T} = \frac{\left(1.00 a t m\right) \left(12.23 L\right)}{\left(0.0821\right) \left(273 K\right)} = 0.546 \text{mol}$