Chemistry Help Please

Question

A gas has a volume of 2.43 L at 1.00 atm and 0.00 ºC (STP). At what temperature does it have a volume of 7.62 L at 335 mmHg ? Report your answer rounded to the hundredth of a ºC. 

Answer 1

You would use the combined gas law. P1V1/T1 = P2V2/T2

Step 1) the units have to match, you are starting with standard P1 of 1 atm so convert P2 from mmHg to atm and celsius to Kelvin.

335mmHg x 1 atm/760mmHg = 0.441atm

at STP ^0C = 273K

Step 2) plug in the values given to the combined gas law.

(1)(2.43)/273 = (0.441)(7.62)/T2

8.90 x^-3 = 3.360/T2

Step 3) solve for T2

T2 = 3.360/8.90 x^-3

T2 = 377.53K

Step 4) convert degrees K to degrees Celsius

273 + X = 377.53

X(T2)= 104.53 ^0C