Question

Moles of Cu in 7.8 * 10^21 atoms of Cu

Answer 1

Step-by-step explanation:

According to mole concept, 1 mole of every substance contains
`6.02 * 10^(23)` atoms or molecules.

As number of atoms present in given copper are
`7.8 * 10^(21)` atoms. Therefore, calculate the number of moles present in this copper atom as follows.

No.of moles =
`(7.8 * 10^(21))/(6.02 * 10^(23))`

=
`1.29 * 10^(-2)`

= 0.0129 mol

Thus, we can conclude that there are 0.0129 moles of copper present in
`7.8 * 10^(21)` atoms.