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massa Al = 5,4 gr
Ar Al = 27
mol Al = 5,4 gr / 27 gr/mol = 0,2 mol
a. perbandingan koefisien reaksi = 2 : 6 : 2 : 3
mol AlCl3 = 2/2 x mol Al = 2/2 x 0,2 mol = 0,2 mol
Mr AlCl3 = 133,5
massa AlCl3 = 0,2 mol x 133,5 gr/mol = 26,7 gram
b. mol H2 = 3/2 x mol Al = 3/2 x 0,2 mol = 0,3 mol
V H2 STP = 0,3 mol x 22,4 liter/mol = 6,72 liter
c.mol H2 = 0,3 mol
V N2 = 1 liter
massa N2 = 2,8 gr, Ar N = 14
mol N2 = 2,8 gr / 28 gr/mol = 0,1 mol
V H2/mol H2 = V N2/mol N2
V H2 = 1 x 0,3 / 0,1 = 3 liter
d. mol H2 = 0,3 mol
T = 27 + 273 = 300 K
P = 3 atm
R = 0,082
V = nRT/P
V H2 = 0,3 x 0,082 x 300 / 3 = 2,46