A 2 mol sample of gas is taken from 2 L container at 0.5 atoms and placed into a new 20 L container that has a pressure of 10 atoms. how many mols of gas are in the new container? a) 0.0025 mols
b) 400 mols
c) 0.01 mols
d)100 mols

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.