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mol Na = 2,3 ÷ 23 = 0,1 mol
a. mol NaOH = mol Na = 0,1
massa NaOH = 0,1 × 40 = 4 gr
b. mol H2 = 1/2 × 0,1 = 0,05
V H2 pada STP = 0,05 × 22,4 = 1,12 L