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N OH 4 1
(a) Fraksi mol NaOH = = N OH: = = 1 ≈ 0,05

4 :5
g N OH 1 g 1
4
5
6
5
(b) Bpj = = = 10 atau bpj = 10 = 10
g u n ,1 g 1

(c) Molalitas = N OH = 4 N COH = 2,8 mol/ g
g H O , 9 g H O

3
(d) Karena massa jenis larutan = = 1 / dan persen massa = y% = 10%,

maka,

Molaritas = 1 ∙ ∙ = 1 ∙1 ∙1 = 2,5 mol/L
M m 4 g/

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