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NaOH ⇒ Na⁺ + OH⁻
0,5 mol 0,5mol 0,5mol
total mol ion = mol Na⁺ + mol OH⁻
= 0,5 + 0,5
= 1 mol
100 ml air = 100 g
mol air = 100/18 = 50/9 mol
fraksi mol ion