Question

urgente porfavor

1. una solucion acuosa de acido perclorico, tiene una densidad de 1,250g/ml y 35%m/m. calcule M,%m/v

Answer 1

35 g de soluto y 65 g de solvente

M = 1.250 g x 1000 mL x 35 g x 1 mol

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1 mL 1 L 100 g 100 g

M = 4.375 mol/L

masa = 1.250 g x 1000 mL x 65 g

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1 mL 1 L 100 g

masa = 812.5 g

calcular Kg H2O = 812.5 / 1000 = 0.8125 Kg

m = mol soluto / Kg svte

m = 4.375 mol / 0.8125 Kg

m = 5.38 mol / Kg svte