1. what is the first step when calculating the molar mass of a compound? a) multiply the total number of atoms in the compound by the combined molar mass. b) add the total number of atoms for each element of the compound together. c) add the molar mass for each element of the compound together to find the total. d) multiply the number of atoms for each element in the compound by their molar mass.

give me abc and i will get it for u.

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.