copper wire consists of copper atoms connected through metallic bonds. find the moles of copper in 1.87 * 1024 copper atoms.

Avogadro's number

1 mole = 6.02.10²³ particles (atoms, molecules, ions)

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.

level 4 to level 2 : ))