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PM . L
PM NaOH = 23 g/mol×1 + 16 g/mol×1 + 1 g/mol×1⇒23+16+1 = 40 g/mol
2000 cm³ × 1 L ⇒ 2 L
1000 cm³
M = 400 g ⇒ 400 g = 5 mol/L
40 g/mol × 2L 80g/mol.L