# What volume is occupied by a 5.0*g mass of ammonia that is placed in a piston and allowed to expand against a pressure of 740*mm*Hg at a temperature of 50 ""^@C?

Sep 15, 2017

So we conceive that in this experiment, a mass of condensed ammonia is enclosed in a piston, which is allowed to expand against a pressure of $740 \cdot m m \cdot H g$ and a temperature of $50$ ""^@C.

#### Explanation:

We use the old Ideal Gas equation.....

$V = \frac{n R T}{P} = \frac{\frac{5.0 \cdot g}{17.03 \cdot g \cdot m o {l}^{-} 1} \times 0.0821 \cdot \frac{L \cdot a t m}{K \cdot m o l} \times 323 \cdot K}{\frac{740 \cdot m m \cdot H g}{760 \cdot m m \cdot H g \cdot a t {m}^{-} 1}}$

$\cong 8 \cdot L$......

Do the units in the expression cancel out to give an answer in litres? If they do not, then we have made a mistake.