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Calculate the molarity of potassium dichromate solution by adding 9.76 g ofk2cr207 in a 1 00-ml volumetric flask. Atomic mass of Potassium, Chromium, Oxygen are 39.098, 51.996, 15.999 g/mol, respectively. (a) (b) (c) (d) 0.33 m 0.03 m 0.0009 m 0.0004 m
Accepted Answer
Calculating Molarity: To calculate the molarity of a solution, we need to determine the number of moles of solute dissolved in a specific volume of the solution, typically expressed in liters. Step 1: Convert the mass of K2Cr2O7 to moles Mass of K2Cr2O7 = 9.76 g Molar mass of K2Cr2O7 = 294.18 g/mol Moles of K2Cr2O7 = 9.76 g / 294.18 g/mol = 0.0332 mol Step 2: Convert the volume of solution to liters Volume of solution = 100 mL = 0.1 L Step 3: Calculate the Molarity Molarity = Moles of solute / Volume of solution in liters Molarity = 0.0332 mol / 0.1 L = 0.332 M Therefore, the molarity of the potassium dichromate solution is approximately 0.33 M. The correct answer is (a) 0.33 M.
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