# How many moles of gas are contained in 890.0 mL at 21.0 °C and 750.0 mmHg pressure?

Jun 9, 2018

There are $0.0364 \cdot m o l$... with respect to the gas...

#### Explanation:

We solve the Ideal Gas equation using $R = 0.0821 \cdot L \cdot a t m \cdot {K}^{-} 1 \cdot m o {l}^{-} 1$...and we know that $760 \cdot m m \cdot H g \equiv 1 \cdot a t m$...

$n = \frac{P V}{R T} = \frac{\frac{750 \cdot m m \cdot H g}{760 \cdot m m \cdot H g \cdot a t {m}^{-} 1} \times 0.8900 \cdot L}{0.0821 \cdot \frac{L \cdot a t m}{K \cdot m o l} \times 294.15 \cdot K}$

$\equiv 0.0364 \cdot m o l$.....