Consider a nickel wall separating hydrogen gas that is maintained on one side at 5 atm and...

Consider a nickel wall separating hydrogen gas that is maintained on one side at 5 atm and on the opposite at 3 atm. If the temperature is constant at 85ºC, determine (a) the mass densities of hydrogen gas in the nickel wall on both sides and (b) the mass densities of hydrogen outside the nickel wall on both sides.