NEED HELP ASAP!! (If you can show the work on how you got the answers that would be greatly appreciated)

74. The composition of a hydrate is given in the circle graph shown at the right.
What is the formula and name of this hydrate?
75. Challenge An 11.75-g sample of a common hydrate of cobalt(II) chloride
is heated. After heating, 0.0712 mol of anhydrous cobalt chloride remains. What
is the formula and the name of this hydrate?

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.

you need to have a picture of the atom that way we can answer it