Determine mass contribution for the following isotopes of the same element. At the end, tell me the atomic mass of the element using the mass contributions.

Do not forget your units or the question will be marked incorrect.

Isotope 2 amu: 186.956

percent abundance: 62.6%

Atomic Mass of the element ?

so she was walking and she stepped on warm jeffy , uh uh uhh dadye i just pooped my pants

you didnt put any of the following

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.