Question

How many atoms are found in 3.45g of CO2?

Answer 1

Answer: The number of carbon and oxygen atoms in the given amount of carbon dioxide is
`4.72* 10^(22)` and
`9.44* 10^(22)` respectively

Step-by-step explanation:

To calculate the number of moles, we use the equation:

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

Given mass of carbon dioxide gas = 3.45 g

Molar mass of carbon dioxide gas = 44 g/mol

Putting values in above equation, we get:

`\text{Moles of carbon dioxide gas}=(3.45g)/(44g/mol)=0.0784mol`

1 mole of carbon dioxide gas contains 1 mole of carbon and 2 moles of oxygen atoms.

According to mole concept:

1 mole of a compound contains
`6.022\time 10^(23)` number of molecules

So, 0.0784 moles of carbon dioxide gas will contain
`1* 0.0784* 6.022* 10^(23)=4.72* 10^(22)` number of carbon atoms and
`2* 0.0784* 6.022* 10^(23)=9.44* 10^(22)` number of oxygen atoms

Hence, the number of carbon and oxygen atoms in the given amount of carbon dioxide is
`4.72* 10^(22)` and
`9.44* 10^(22)` respectively