How many molecules are present in 40g of c02

Hi.

Here is your answer

Given

For oxygen,

Mass of the oxygen = 40 grams.

Molecular mass of the oxygen = 32 grams.

Thus, number of molecules =( mass/ molecular mass) x Avogadro's number.

                                           = (40/32) x Avogadro's number.

Molecular mass of carbon dioxide = 44 grams.

Thus, number of molecules = (mass/44) x Avogadro's number.

According to the question,

       Number of molecules of CO2 = Number of moecules of O2

Therefore,  Mass/44 = 40/32

                       Mass of CO2 = 55 grams.

Thus, mass of carbon dioxide (CO2) = 55 grams.

Hope it will helps u.

Have a nice day.