3. how many molecules would there be in 10.5L of carbon dioxide at 40.0C and 2.25 bar? (use Avogadro's number)

4.
A tank is filled with 300g of ozone (O3(g)) at -58.75C. the pressure inside the tanks is 6250 kPa. calculate the volume (in L) of the tank.

h let me think

tracks, burrows, eggshells, nests, tooth marks, or gastroliths

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.