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5,4g/27 = 0,2 mol
A. Karena perbandingan koefisien, maka mol Al=mol AlCl3=0,2 mol
Mol x Mr = massa
0,2 x 136,5 = 27,3gram
B. Karena perbandingan koefisien maka mol Al= 3/2 mol H2= 0,3mol
Mol. = volume
0,3 . 22,4 = 6,72L