Answer to Question #156030 in General Chemistry for Melodie

Question

Find the mass of water, in grams, must be added to a 1 mole of potassium nitrate (MM = 101.1 g/mol) to prepare 15%m/m? 

Answer 1

Let Mass of Water is " m " gram .

So , % = mass KNO₃ × 100 / Total Mass .

15 = 101.1 ×100 / ( 101.1 + m )

101.1 + m = 101.1 ×100 / 15

m = 572.9 g .