Question

69. Sequencing Arrange these hydrates in order of

increasing percent water content: MgSO;-7H.O.
Ba(OH)2-8H.O. COC1, 6H2O.

Answer 1

In order of increasing percent water content:CoCl₂.6H₂O, Ba(OH)₂.8H₂O, MgSO₄.7H₂O

Further explanation

`\tt \%element=(Ar~element)/(MW~compound)* 100\%`

CoCl₂.6H₂O.MW=237.90 g/mol

6H₂O MW = 6.18=108 g/mol

`\tt \%H_2O=(108)/(237.9)* 100\%=45.4\%`

MgSO₄.7H₂O.MW=246.48 g/mol

MW 7H₂O = 7.18=126 g/mol

`\tt \%H_2O=(126)/(246.48)* 100\%=51.1\%`

Ba(OH)₂.8H₂O MW=315.48 g/mol

MW 8H₂O = 8.18=144 g/mol

`\tt \%H_2O=(144)/(315.48)* 100\%=45.6\%`