The air pressure in a car tire is at 2.0 atm, after a long car ride the tire pressure is at 2.5 atm at 310.2 K. what was the original temperature of the air in the tire?
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with this one i know the answer in craters one reason i looked it up and i learned about it there is my evidence

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

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.