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n=11,2/22,4
n= 0,5
gram = n x mr
gram = 0.5 x 254
gram = 127 gram
STP
mol Cl₂ = V/22,4 = 11,2/22,4 = 0,5 mol
Perb. koefisien = perb. mol
mol Cl₂ = mol I₂ = 0,5 mol
massa I₂ = mol x Mr = 0,5 x 254 = 127 gram