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Gunakan rumus : Hubungan fraksi mol (x) dengan molalitas (m)
Rumus : m = XNaOH . 1000 / (1 - X NaOH) . Mr H20
m = 0,1 . 1000 / ( 1 - 0,1 ) . 18
m = 100 / 0,9 . 18
m = 100 /162
m = 0,617 m