Question

Question #ddb20

Answer 1

4.56 Litres is the volume.

Explanation:

Being 58,44 g/mol the molar mass of NaCl, 40 g of NaCl correspond to 0.684 moles:
`n = (40" g")/(58.44 " g/mol") = 0.684 " moles"`

A solution 0.15 m (molal) contains 0.15 moles of solute per kilogram of solvent (water).
Grouping the 0.684 moles in portions of 0.15 moles (with one kg of water for each portion) we have 0.684÷0.15 = 4.56 kilograms of water.
With three significant figures, the density of water of 0,9982 kg/L
is rounded to d = 1.00 kg/L at 20 °C. Then the volume is 4.56 litres.