A tank of oxygen has a volume of 1650 L. The temperature of the gas inside is 35 degrees Celsius. If there are 9750 moles of oxygen in the tank what is the pressure in PSI?

PV = nRT is the ideal gas law.

Solve for P to get P = nRT/V

P = (9750 moles x (0.0821 L x atm/K x moles) x 308 K) / 1650 L

P = ? atm

Use the conversion between atm and PSI to get your answer.