What is the molarity of 409.55 mL of solution in which 4.2 moles of sodium bromide is dissolved?

To calculate the molarity of a solution, you need to know the number of moles of solute and the volume of the solution in liters.

The formula for molarity (M) is:

M = moles of solute / liters of solution

Given in the problem, we have:

moles of solute (sodium bromide) = 4.2 moles volume of solution = 409.55 mL

First, we need to convert the volume from milliliters to liters. There are 1000 milliliters in a liter, so:

409.55 mL = 409.55 / 1000 = 0.40955 L

Now we can substitute these values into the formula:

M = 4.2 moles / 0.40955 L = 10.25 M

So, the molarity of the solution is 10.25 M.