What mass of hydrogen gas H2 at 0 °C and 1 atm could be contained in a vessel that holds 4.0 g of oxygen gas O2

at 0 °C and 1 atm?

1 answer

the container has a volume of 4.0/32 = 1/8 mole of O2
Since the pressure and temperature are the same, the container will hold 1/8 mole of H2, or 0.25 g