Assume a gasoline is isooctane, which has a density of 0.692 g/ml. what is the mass of 3.8 gal of the gasoline (1 gal = 3.78 l)?

Density is the ratio of mass to the volume.

The mathematical expression is given as:

Now, density of isooctane =

Volume  =

Since, 1 gallon = 3.78 L

So, 3.8 gal =

=

As, 1 L = 1000 mL

Therefore, =

Volume in mL =

Put the values,

=

Hence, mass of 3.8 gal of the gasoline is .

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8

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.