Question

If 25.5 g of potassium bromide is dissolved in enough water to make 1.75 L of solution, what is the molarity of the solution?

Answer 1

To determine the molarity of the solution, divide the number of moles of potassium bromide (0.2143 mol) by the volume of the solution (1.75 L) to get a molarity of 0.1225 M.

Step-by-step explanation:

To calculate the molarity of a potassium bromide solution when 25.5 g of potassium bromide is dissolved in enough water to make 1.75 L of solution, you first need to find the number of moles of potassium bromide. The molar mass of potassium bromide (KBr) is 119.0 g/mol. Therefore:

• Number of moles = mass (g) / molar mass (g/mol) = 25.5 g / 119.0 g/mol = 0.2143 mol

Then, the molarity (M) which is the number of moles per liter of solution can be found by:

• Molarity (M) = number of moles / volume (L) = 0.2143 mol / 1.75 L = 0.1225 M

Therefore, the molarity of the potassium bromide solution is 0.1225 M.