Answer to Question #276183 in General Chemistry for mack

Question

A chemist prepares a solution of sodium chloride 

NaCl by measuring out 15.8g of sodium chloride into a 500.mLvolumetric flask and filling the flask to the mark with water.Calculate the concentration in /molLof the chemist's sodium chloride solution. Be sure your answer has the correct number of significant digits.

Answer 1

Mass of NaCl=25.4 g

Moles of NaCl=25.4/[23+35.5]

=0.434 mol

Volume of solution=100 ml=0.100 L

Molarity=Moles of solute/volume of solution

=0.434/0.100

=4.34M