Question

How many atoms of gold (Au) are equal to 212g of gold?

Answer 1

Given :

Mass of gold ( Au ) is 212 gram.

To Find :

Atoms of gold present in 212 gram of gold.

Solution :

Molecular mass of gold is 197 gram.

So, number of moles of gold in 212 gram is :

`n = (212)/(197) \ moles\\\\n = 1.076 \ moles`

Now, we know 1 mole of any element contains
`6.022 * 10^(23)` atoms.

So, number of atoms present in 1.076 moles are :

`N = 1.076 * 6.022* 10^(23)\\\\N = 6.48 * 10^(23)`

Hence, this is the required solution.