calculate the number of sodium ions, perchlorate ions, Cl atoms and O atoms in 26.6 g of sodium perchlorate. Enter in scientific notation?

The chemical formula of sodum perchlorate is NaClO₄.

Molar mass of NaClO₄ = 23 + 35.5 + 16×4 = 122.5 g/mol
Number of moles of NaClO₄ = 26.6/122.5 = 0.217 mol

1 mole of NaClO₄ contains 1 mole of ClO₄⁻ ions.
Number of moles of ClO₄⁻ ions = 0.217 mol

1 mole of NaClO₄ contains 1 mole of Cl atoms.
Number of moles of Cl atom = 0.217 mol

1 mole of NaClO₄ contains 4 moles of O atoms.
Number of moles of O atom = 0.217 × 4 = 0868 mol