Question

What is the molarity of a solution made by dissolving 50.0 g of HBr in enough water to

make 600. mL of solution?​

Answer 1

1.06M

Step-by-step explanation:

Given parameters:

Mass of HBr = 50g

Volume of water = 600mL

unknown:

Molarity of the solution = ?

Solution:

The molarity of a substance is the number of moles of solute in a volume of solution.

Mathematically;

Molarity =
`(number of moles )/(volume)`

Since the number of moles is unknown, let us solve for it;

Number of moles =
`(mass)/(molar mass)`

Molar mass of HBr = 1 + 80 = 81g/mol

Number of moles =
`(50)/(81)` = 0.64mole

Convert the volume to liters or dm³; 600mL = 0.6L or 0.6 dm³

Input the parameters and solve;

Molarity =
`(0.64)/(0.6)` = 1.06M