calculate the density of O2 gas( in g/L) at 1.22 atm and 25 degrees C

Answer 1

Use PV = nRT.
Calculate n, number of moles.
n x molar mass = grams.
If you plugged in 1.00 L for the volume, then g/L will be the density.

Answer 2

2.9g/l

Answer 3

1.595 or 1.60