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Massa terlarut = NaCL = 2,34 gram
Massa pelarut = 90 ml = 90 gram
nt = massa/Mr = 2,34/58 = 0,04 mol
np = massa/Mr = 90/58 = 1,55 mol
Xt = 0,04/ 0,04 + 1,55 = 0,04/1,59 = 0,02