Answer to Question #290826 in General Chemistry for sheng

Question #290826
  1. A solution contains 20.5 g of sodium chloride dissolved in sufficient water to give a total mass of 166.2 g. What is the molality of the solution?
1
Expert's answer
2022-01-27T08:29:01-0500

Mass of Sodium chloride ( NaCl ) = 20.5 g

Molar mass of Sodium Chloride ( NaCl )

= 58.5 g / mol.

Moles of Sodium Chloride = 20.5 / 58.5 mol.

= 0.350 mol.


Total Mass of water = 166.2 g .

Density of water = 1 g / ml .

So, Volume of water = 166 .2 ml .

For Dilute Solution


Volume of water = Volume of Solution

= 166.2 ml. = 0.1662 litre .


Molarity =

moles of NaCl / Volume of Solution in litre .


= 0.350 mol . / 0.1662 litre.

= 2.1058965102 M

= 2.11 M

= 2.11 mol/ litre .




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