Question

4.92x1022 atoms Na = _____ mol Na2O

Answer 1

Answer:

0.41mole

Explanation:

Given quantity:

           Number of atoms of Na  = 4.92 x 10²² atoms

Number of moles in this atom;

      6.02 x 10²³ atoms is found in 1 mole of a substance

     4.92 x 10²² atoms will have $\frac{4.92 x 10^{22} }{6.02 x 10^{23} }$   = 0.82 x 10⁻¹   = 0.082mole

So;

      In Na₂O;

          2 mole of Na is found in 1 mole of Na₂O

         0.82mole of Na will be found in $\frac{0.82}{2}$  mole of Na₂O = 0.41mole of Na₂O