Gases

46)  CaH₂(s) + 2H₂O(l) Ca(OH)₂(aq) + 2H₂(g)

        V = 64.5 L H₂         T = 32°C = 305 K

        P = 814 torr            R = 0.0821 L•atm/mol/K

        PV = nRT

        n = 814 torr * 1 atm/760 torr * 64.5 L/0.0821 L•atm/mol/K/305 K

        n = 2.76 mol H₂

        m = 2.76 mol H₂ * 1 mol CaH₂/2 mol H₂ * 42.01 g CaH₂/1 mol CaH₂

        m = 58.1 g CaH₂