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V = 2,8 g
mr = m / n
STP
V = 22,4 x n
22,4 n = 2,8
n = 2,8/22,4
n = 0,125 mol
mr = 4,25 / 0,125 = 34
kalau ga salah gitu caranya
Mr gas = garam / mol = 4,25 / 1/8 = 34