molarity is defined as the number of moles of solute in 1 L of solution molarity of solution to be prepared is 0.85 M this means that there should be 0.85 mol of KBr in 1 L of solution if 1 L contains - 0.85 mol then 25.0 mL should contain - 0.85 mol / 1000 mL x 25.0 mL = 0.0213 mol mass of KBr - 0.0213 mol x 119 g/mol = 2.53 g mass of KBr that should be dissolved in 25.0 mL is 2.53 g
