What number of moles of oxygen would exert a pressure of 10 atm at 320 K in an 8.2 dm3 3 cylinder? [R=0.082 atm dm−3 − 3 mol−1 − 1 K−1 − 1 ]

What number of moles of oxygen would exert a pressure of 10 atm at 320 K in an 8.2 dm3 ${}^3$ cylinder?
[R=0.082 atm dm−3 ${}^{-3}$ mol−1 ${}^{-1}$ K−1 ${}^{-1}$]