Question

A saline solution contain 40g of sodium chloride and 320 g of water. Calculate the number lf miles of common salt present in the solution and the number of molecules of watet present in the solutilm answer based on chaptet atoms and molecules of myguide

Answer 1

The number of moles of common salt present in the given solution can be calculated using the formula: No. of moles = Given weight/Molar mass

Given weight of sodium chloride = 40 g

Molar mass = 23 + 35.5 = 58.5 g

Therefore, number of moles = 40/58.5 = 0.6837 moles

Number of molecules of water present in the solution = No. of moles of water * Avogadro number

No. of moles of water = 320/18 = 17.78 moles

Number of molecules = 17.78 * 6.022 * 10²³ =  1.07 * 10²⁵