Question

A sample of Freon-12 (`CF_2Cl_2`) occupies 25.5 L at 298 K and 153.3 kPa. How do you find its volume at STP?

Answer 1

`V_(STP)=35.3L`

Explanation:

Using the combined gas law...

`(P_1*V_1)/T_1` = `(P_2*V_2)/T_2`

Solve for `V_2` ...

`V_2=(P_1*V_1*T_2)/(T_1*P_2*)`

`P_1=153.3"KPa"color(white)(xxx)P_2=101.325KPa`
`V_1=25.5Lcolor(white)(xxxxxx)V_2=?`
`T_1=298K"color(white)(xxxxxx)T_2=273K`

`V_2=(25.5L*153.3cancel(KPa)*273cancel(K))/(101.325cancel(KPa)*298cancel(K))=35.3L`