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. What mass of O2 does the tank contain in Kg?

I used the formula density=(MM)(P)/(R)(T) I found the molar mass of O2 to be 32, the pressure to be 160 atm, R=.0821, and the temperature 300.15 K. I found the density to be 207.8. Then I multiplied the density by 80L, the volume, to get 16621.8, which is 1.7 Kg.

It says I got it wrong but I don't know why or what I could have done differently.