Answer to Question #310696 in General Chemistry for candyfloss

Question

  Anhydrous copper(II) sulfate is difficult to dry completely. What mass of copper(II) sulfate would remain after removing 90% of the water from 250. g of CuSO₄×5H₂O? 

Answer 1

Molar mass=249•7

Molar mass of water in salt= 90

Mass of water in the salt= 90/249.7= 90.1g

(90/100)×90.1= 81.09= mass removed

Remaining mass= 250_-81.09= 168.9g