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V O2 = 2,5 liter
mol O2 = 8 gr / 32 gr/mol = 0,25 mol
V H2/mol H2 = V O2/mol O2
mol H2 = 15 x 0,25 / 2,5 = 1,5 mol
perbandingan koefisien reaksi X : H2 = 1 : 2
mol X = 1/2 x mol H2 = 1/2 x 1,5 mol = 0,75 mol
Ar X = 36 gr / 0,75 mol = 48 gr/mol