Question

How many molecules are in 165 g of carbon dioxide?

Answer 1

The molar mass of CO2 is 44 grams per mole.

165 grams / 44 grams per mole of CO2 = 3.75 moles CO2

Using Avogadro’s law where 1 mole of substance equals 6.023 x 10^23 molecules

3.75 moles CO2 (6.023 x 10^23 molecules /mole) = 2.26 x 10^24 molecules CO2

Answer 2

Answer:
`22.6 * 10^(23)` molecules

Step-by-step explanation:

To calculate the moles, we use the equation:

`\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}`

For
`CO_2`

Given mass= 165 g

Molar mass of
`CO_2` = 44 g/mol

Putting values in above equation, we get:

`\text{Moles of}CO_2 =(165g)/(44g/mol)=3.75mol`

According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number
`6.023* 10^(23)` of particles.

1 mole of
`CO_2` contains =
`6.023* 10^(23)` molecules of
`CO_2`

Thus 3.75 moles
`CO_2` contains =
`(6.023* 10^(23))/(1)* 3.75=22.6 * 10^(23)` molecules of
`CO_2`

Thus there will be
`22.6 * 10^(23)` molecules of
`CO_2`