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40 g/mol
M = 1 mol = 2,5 molar (Respuesta)
0,4 L
M = gramos soluto
MM × Litros sol
MM NaOH = (22,98×1+15,99×1+1,007×1) ⇒22,98+15,99+1,007= = 39,997 g/mol
400 ml × 1 L ⇒ 0,4 L
1000 ml
M = 40 g ⇒ 40 g = 2,5 mol/L
39,997 g/mol × 0,4 L 15,9988 g/mol .L
M = 2,5 mol/L