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2 X³⁺ + 6 HCl ---> 2 XCl₃ + 3 H₂ (setara)
Volume H₂ STP (0 derajat 1 atm) = 6,72 liter
Volume H₂ = mol H₂ x Volume STP (22,4)
6,72 = mol H₂ x 22,4
mol H₂ = 0,3 mol
untuk mencari mol logam X dapat menggunakan cara perbandingan mol yaitu
mol X = 0,2 mol
Ar = massa : mol
Ar X = 5,4 : 0,2
Ar X = 27