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jumlah molekul NH3 = 0,1 × 6,02 × 10^23 = 6,02 × 10^22
b. mol NO2 = 0,1 ÷ 46 = 0,002 mol
jumlah molekul NO2 = 0,002 × 6,02 × 10^23 = 1,204 × 10^21
c. NaCl ⇔ Na^+ + Cl^-
0,5 0,5 0,5
mol NaCl = mol Na^+ = mol Cl^- = 0,5