Ideal Gas Law: a Sealed 89- Tank Is Filled

Ideal gas law: A sealed 89- tank is filled with 6000 moles of oxygen gas (O₂) at an initial temperature of 270 K. The gas is heated to a final temperature of 350 K. The ATOMIC mass of oxygen is 16.0 g/mol, and the ideal gas constant is R = 8.314 J/mol · K = 0.0821 L · atm/mol · K. The initial pressure of the gas is closest to

A) 0.15 MPa.
B) 0.17 MPa.
C) 0.19 MPa.
D) 0.13 MPa.
E) 0.11 MPa.