Question

How many molecules of carbon dioxide (CO2) are there in 69.56g of carbon dioxide?

Answer 1

9.52 x 10²³molecules

Step-by-step explanation:

Given parameters:

Mass of carbon dioxide = 69.59g

Unknown:

Number of molecules = ?

Solution:

To solve this problem, we must understand:

1 mole of a substance contains 6.02 x 10²³ molecules

Now, first find the number of moles of carbon dioxide;

Number of moles =
`(mass)/(molar mass)`

Molar mass of carbon dioxide = 12 + 2(32) = 44g/mol

Number of moles =
`(69.59)/(44)` = 1.58moles

So;

1 mole of a substance contains 6.02 x 10²³ molecules

1.58moles of carbon dioxide will contain 1.58 x 6.02 x 10²³

= 9.52 x 10²³molecules