A solution of is 31.4% by mass and has a density of 1.25 g/mL. The molarity of the solution is M (nearest integer)

[Given: molar mass of = 98 g mol⁻¹]

Question

A solution of  is 31.4%  by mass and has a density of 1.25 g/mL. The molarity of the  solution is  M (nearest integer)

[Given: molar mass of  = 98 g mol⁻¹]

Canvas Classes · Accepted Answer

Strategy:
 Molarity () is moles of solute per liter of solution. Use the density and weight percentage to find the mass of solute in 1 liter of solution, then convert that mass to moles.

Step 1: Calculate the mass of 1 liter (1000 mL) of solution
Density = 1.25 g/mL.

Step 2: Determine the mass of  in this volume
The solution is 31.4%  by mass.

Step 3: Calculate the number of moles
Molar mass of .

Step 4: Identify Molarity
Since 4.005 moles are present in 1 liter, the molarity is .

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