A 2500 mL aqueous solution was made using 900 g of ammonium

A 250.0 mL aqueous solution was made using 90.0 g of ammonium dichromate. What is the molarity of the solution?

Solution

Mass of ammonium dichromate = 90g

Molar mass = 252.07g/mol

Moles = 90g/252.07g/mol = 0.357 moles

Volume = 250mL = 0.250L

Molarity= 0.357moles/0.250L = 1.43M