a solution of calcium chloride contains 35.0 g calcium chloride 425.0 g water. what is the percentage by mass of calcium chkoride in this solution

Explanation:

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In this case, since the percentage by mass of a solute in a solvent is computed as shown below:

Now, as the solute here is calcium chloride and has a mass of 35.0 g and the solvent is water with a mass of 425.0 g, we can compute the percentage by mass as shown below:

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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.