Question

How many atoms are in 165 g of calcium?

Answer 1

165/40=N/6.02×10^23
N=2.48325×10^24
hope it helped

Answer 2

Step-by-step explanation:

According to the mole concept, 1 mole of every atom contains
`6.022 * 10^(23)` atoms.

It is given that mass is 165 g and molar mass of calcium atom is 40.078 g/mol.

Hence, number of moles of calcium atom will be calculated as follows.

No. of moles =
`\frac{mass}{\text{molar mass}}`

=
`(165 g)/(40.078 g/mol)`

= 4.117 mol

Therefore, atoms present in 4.117 mol of calcium are as follows.

`4.117 mol * 6.022 * 10^(23)` atoms/mol.

=
`24.792 * 10^(23)` atoms

Thus, we can conclude that there are
`24.792 * 10^(23)` atoms in 165 g of calcium.