The number of atoms, molecules or ions present in a mole of an element, compound and ions are 6.022 x 1023 respectively.
The number of ions present in one mole of sodium ions = 6.022 x 1023 ions
The number of ions present in 0.187 mole of sodium ions = 0.187 x 6.022 x 1023 ions
The number of ions present in 0.187 mole of sodium ions = 1.1261 x 1023 ions
The number of ions present in one mole of sodium ions = 6.022 x 1023 ions
The number of ions present in 0.187 mole of sodium ions = 0.187 x 6.022 x 1023 ions
The number of ions present in 0.187 mole of sodium ions = 1.1261 x 1023 ions