Chemistry Help (Gases)?

Question

If 4.25g of a diatomic gas is stored in 2.0L container at a temperature of 22degree C and a pressure of 10.8psi, what is the identity of the gas?

Answer 1

MM= gRT/PV = 4.25 g * 0.08206 * 295 K / (0.735 atm * 2 L)
MM= 70.0 g/mol

Most likely chlorine (Cl2 MM is 71 g/mole).