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

There are 2.258 x 10^24 molecules of CO2 in 165 grams of CO2.

Explanation:

First you have to calculate the molar mass of carbon dioxide ⇒ 44 grs/mol. Then,

44 grs 1 mol CO2

165 grs x = 3.75 moles of CO2.

Then, from Avogadros constant we have that there are 6.022 x 10^23 molecules in 1 mol. So,

1 mol CO2 6.022 x 10^23 molecules CO2

3.75 moles CO2 x = 2.258 x 10^24 molecules CO2.

There are 2.258 x 10^24 molecules CO2 in 165 grams of CO2.