Question

Cuantos gramos de hidroxido de sodio se necesitan para preparar un litro de solucion 1m !

Answer 1

Mm NaOH = 40 g/mol

1 L = 1 Kg

1. calcular moles soluto despejando de la fórmula

m = mol soluto /Kg Svte

mol soluto = 1 L  x  1 mol /L

mol soluto = 1

2. calcular masa de NaOH

masa = 1 mol  x  40 g
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                           1 mol

masa = 40  g de NaOH

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Como el ejercicio dice litro de solución

M = 1 mol / L

dspejar mol soluto  de la fórmula de molaridad

M = mol soluto / V(L)

mol soluto = 1 mol /L  x  1 L

mol = 1

calcular masa

masa = 1 mol x 40 g/mol

masa = 40 g de NaOH

M = 1 molar