The problem states:

Many gases are shipped in high-pressure containers. Consider a steel tank whose volume is 80.0 L and which contains O2 gas at a pressure of 16300 kPa at 27°C.

At what temperature in Celsius would the pressure in the tank equal 150 atm?

I used the formula T=PV/nR, so I did (150atm)*(80L)/(521.875mol)(.0821) and I got 280.073. Then I subtracted 273.15 to get 6.923 degrees in celsius, but it says I got it wrong