How many moles of pbr3 contain 3.68 x 10^25 bromine atoms?

20.4 moles of contain bromine atoms

Explanation:

1 molecule of molecules

So, there are atoms of Br in 1 mol of

Hence bromine atoms are present in moles of or 20.4 moles of

c.

explanation:

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.