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2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂
* Mencari mol Al
mol Al = massa/Ar
mol Al = 8,1/27
mol Al = 0,3 mol
* Mencari mol H₂
Perbandingan koefisien = perbandingan mol
mol H₂ = koef H₂/koef Al x mol Al
mol H₂ = 3/2 x 0,3
mol H₂ = 0,45 mol
* Mencari mol N₂
mol N₂ = massa/Mr
mol N₂ = 14/28
mol N₂ = 0,5 mol
* Mencari Volume H₂
V N₂/n N₂ = V H₂/n H₂
2/0,5 = V H₂/0,45
2 x 0,45 = 0,5 x V H₂
V H₂ = (2 x 0,45)/0,5
V H₂ = 1,8 Liter
Jadi, volume H₂ yang dihasilkan adalah 1,8 Liter