What is the mass percent of Chlorine in the compound copper (II) chloride tetrahydrate?

1 Answer
Mar 13, 2018

34.4%

Explanation:

Calculate the molar mass of compound CuCl_2*4H_2O.
It is 206.5 g/(mol).
Now find the mass of chlorine in this compound. There are two chlorine atoms in the compound, therefore 2*35.5=71g/(mol)

If 206.5 g/(mol) – 100%
then 71g/(mol) – x%

Cross multiply and get x = 34.4%