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V HCl= V2 = 100 ml = 0,1 L
M HCL = M2 = 0,4 M.
Mr LOH2 = Mr 1 = ?
V1 x M1 = V2 x M2
mol 1 = 0,1 x 0,4
m/mr = 0,04
3,42 = 0,04 mr
mr = 3,42/0,04
= 85,5