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2014-08-24T14:11:20+07:00
Mr NaOH = ( 1 x Na) + (1 x O) + (1 x H)
              =  23 + 16 + 1 = 40
Nb = 20/40 = 1/2 = 0.5
na = 100/18  = 5,6
Xb = nb/na+nb = 0,5/5,6+0,5 =0,08
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