The volume of a sample of oxygen is 300 mL when the pressure is 1 atm and the temperature is 27 C.

At what Celsius temperature is the volume 1 L and the pressure .500 atm?

a. 22 C

b. 45 C

c. .5 K

d. 227 C

 

I used the combined gas law and set up the proportion of PV/T

 

(1 x 300 m)/27 = (.5 x 1000 m)/x

I solved for x (the temperature) and got 45, but the answer is 227.

 

What did I do wrong?

Your temperature units need to be in Kelvin and you volume in litres. Otherwise correct.

 

Edit: I didn't see you'd converted both to mL. That part should work out since you changed both, but you should get in the habit of keeping it in L.