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QUESTION

# How many molecules are in 165 g of carbon dioxide?

2.258 xx 10^24 molecules

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")