Question

Hallar la concentración molar

6,5 g de NaCl disueltos en 300 ml de agua

Answer 1

Hallar la concentración molar  6,5 g de NaCl disueltos en 300 ml de agua

Mm NaCl = 58.5 g/mol

1. calcular moles de soluto

n = masa/Mm

n = 6.5 g / 58.5 g/mol

n = 0.111 moles de soluto

2. calcular el volumen en Litros

V = 300 / 1000

V = 0.300 L

3. Calcular la Molaridad

M = n soluto / V(L) solc.

M = 0.111 mol / 0.300 L

M = 0.37 Molar

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Resolución por factor de conversión

M = 6.5 g  x  1000 mL  x  1  mol

    ⁻⁻⁻⁻⁻⁻⁻⁻⁻   ⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻   ⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻

   300 mL        1 L            58.5 g

M = 0.37 molar