Question

Calculate the number of atoms in `0.2` mole of sodium (Na).

Answer 1

We know that 1 mole of atoms contains `6.022 xx 10^(23)` atoms.
Now,
`1` mole of sodium atoms `= 6.022 xx 10^(23)` atoms
So, `0.2` mole of sodium atoms `= 6.022 xx 10^(23) xx 0.2` atoms
`= 12.044 xx 10^(22)` atoms
Thus, `0.2` mole of sodium element has `12.044 xx 10^(22)` atoms in it.