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 Latm/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