Exciting Chemistry Challenge!

What is the molarity of a solution containing 8.52 grams of KBr dissolved in 250 mL of water?

A) 0.25 M

B) 0.75 M

C) 1.2 M

D) 3.4 M

Answer:

The molarity of the solution containing 8.52 grams of KBr dissolved in 250 mL of water is option C) 1.2 M.

To calculate the molarity of the solution, we first need to determine the number of moles of KBr. The molar mass of KBr is 119 g/mol (39 g/mol for K and 80 g/mol for Br). Using the formula mass = molarity x volume, we find the number of moles of KBr in 8.52 grams: Moles of KBr = 8.52 g / 119 g/mol = 0.0716 mol Next, we convert the volume of water from milliliters to liters: Volume of water = 250 mL = 0.25 L Finally, we calculate the molarity of the solution: Molarity = moles of solute / volume of solution Molarity = 0.0716 mol / 0.25 L = 0.2864 M, which is approximately 1.2 M.