Question

What is the percentage of water in the hydrate CoCl2 • 6H2O? Show work

I'm confused whether it's 52.17% or 45%

Answer 1

mm = molar mass
mm CoCl2.6H2O= (mm CoCl2 + mm H2O x 6)= ??
mm H2O x 6 = ?

%H2O =( mm H2Ox6/mm CoCl2.6H2O)*100 = ?

Answer 2

mm CoCl2.6H2O= (mm CoCl2 + mm H2O x 6)= 108g H2O

%H2O =( mm H2Ox6/mm CoCl2.6H2O)*100 = ?45%?????

Answer 3

(108/237.9)*100 = about 45% but with that many significant digits in the numbers I would have used AT LEAST 3 in the answer)

Answer 4

3 where?

Answer 5

At the end! That means not 45% but 45.1% or 45.2% or 45.3% or whatever that third digit is..

Answer 6

45.39 %