# For a given quantity of gas which has a specific volume under a given pressure and temperature, how would we find its volume under changed conditions of temperature and pressure?

Jan 29, 2017

By the combined gas law, $\frac{{P}_{1} {V}_{1}}{T} _ 1 = \frac{{P}_{2} {V}_{2}}{T} _ 2$
Given $\text{STP}$, which is $0$ ""^@C, and $100 \cdot k P a$, you can easily substitute in to find ${V}_{2}$, i.e.
$\frac{{P}_{1} {V}_{1} \times {T}_{2}}{{T}_{1} \times {P}_{2}} = {V}_{2}$
Have at it..........How could you find the mass of gas, given that $\text{freon-12}$ is $C {\left(C l\right)}_{2} {F}_{2}$?