Chemistry Molarity Solution: Ammonium chloride, NH4Cl, is a very soluble salt i...

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Solution: Ammonium chloride, NH4Cl, is a very soluble salt in water.If you dissolve 16 g of ammonium chloride in 500.0 mL of water, what is the molar concentration of the solution?

Problem

Ammonium chloride, NH4Cl, is a very soluble salt in water.

If you dissolve 16 g of ammonium chloride in 500.0 mL of water, what is the molar concentration of the solution?

Solution

We’re being asked to calculate the molarity (M) of ammonium chloride (NH4Cl) in a solution. Recall that molarity is the ratio of the moles of solute and the volume of solution (in liters). In other words:


Molarity(M) = moles of soluteLiters of solution


We first need to determine the number of moles of NH4Cl


To find the moles of NH4Cl, we’ll need its molar mass. The molar mass of NH4Cl is:

NH4Cl        1 N × 14.01 g/mol C = 14.01 g/mol

                  4 H × 1.01   g/mol H = 4.04 g/mol        

                  1 Cl × 35.45 g/mol O = 35.45 g/mol     

  Sum = 52.5 g/mol


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