What is the molarity of a solution composed of 8.210 g of potassium chromate, K2CrO4 (molar mass = 194.20 g/mol), dissolved in enough water to make 0.500 L of solution? (Show all work
Question
What is the molarity of a solution composed of 8.210 g of potassium chromate, K2CrO4 (molar mass = 194.20 g/mol), dissolved in enough water to make 0.500 L of solution? (Show all work
Solution
Step 1: Calculate the number of moles of K2CrO4
The number of moles is calculated by dividing the mass of the substance by its molar mass.
Moles of K2CrO4 = 8.210 g / 194.20 g/mol = 0.0423 mol
Step 2: Calculate the molarity
Molarity (M) is defined as the number of moles of solute per liter of solution.
Molarity = Moles of solute / Volume of solution in liters
Molarity = 0.0423 mol / 0.500 L = 0.0846 M
So, the molarity of the solution is 0.0846 M.
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