Question

Fraksi mol naoh mr=40 dengan persentase berat 20% ADALAH...

Answer 1

Anggap berat total =100
% NaOH = 20 % x 100 = 20 gram
n= gr/mr = 20/40 =0,5 mol

gr air = 100-20= 80 gram 
n air = gr/mr = 80/18 = 4,4 mol

x =       n NaOH         = 0,5/4,9 = 0,1
        nNaOH + nair

Answer 2