A sample of argon has a volume of 205 cm3 when it's temperatures is -44 degrees C. and its pressure is 712 mm of Hg. What would be the volume of the argon at STP?

1 Answer
Jul 3, 2017

We use the combined gas law, which states for a GIVEN quantity of gas..........P1V1T1=P2V2T2; and we eventually get V2230cm3

Explanation:

T is always expressed as temperatura assoluta, which sets absolute zero at 0K273.15 C. And depending on your syllabus, STP specifies a temperature of 273.15K, and a pressure of 1atm. And we know that 1atm will support a column of mercury that is 760mm high.........

We want V2=P1×V1×T2P2×T1.....

And already we see from the quotient we ARE going to get an answer with VOLUME units........ as required.

V2=712mmHg×205cm3×273.15K760mmHg×229.15K

230cm3...........