How many molecules are in 165 g of carbon dioxide?

1 Answer

Answer:

#2.258 xx 10^24# molecules

Explanation:

We use Avogadro's number of #6.022xx10^23# molecules per mole to calculate the number of molecules from the number of moles represented by #"165 g"# of carbon dioxide.

The gram-molecular weight of carbon dioxide can be calculated from the atomic weights for carbon and oxygen (two of them in #"CO"_2#) given in a Periodic Table of the Elements.

#("165 g CO"_2)/("44.01 g/mol") xx (6.022xx10^23 "molecules")/"mol"#

#= \mathbf(2.258xx10^24 "molecules")#