Calculate the molarity of a solution made by dissolving 12.5 g of Na2CrO4 in enough water to make exactly 750 mL of solution.
Guide On Rating System
Vote
To calculate the molarity of the solution, we need to know the number of moles of Na2CrO4 and the volume of the solution.
Step 1: Calculate the molar mass of Na2CrO4.
Na2CrO4 = (2 x 22.99 g/mol) + 51.996 g/mol + (4 x 16.00 g/mol) = 161.971 g/mol
Step 2: Calculate the number of moles of Na2CrO4.
molar mass = mass / moles
moles = mass / molar mass
moles = 12.5 g / 161.971 g/mol ≈ 0.0771 mol
Step 3: Convert the volume of the solution to liters.
volume = 750 mL = 750 mL x (1 L / 1000 mL) = 0.750 L
Step 4: Calculate the molarity of the solution.
Molarity = moles / volume
Molarity = 0.0771 mol / 0.750 L ≈ 0.1029 M
Therefore, the molarity of the solution is approximately 0.1029 M.
Got a question with my answer?
Cheapmath.com is completely free!
Asking question is free.
Getting answers is free.
+99