Compute the numbe

Moles of NaCl present in 5.85 g = 5.85g /58.5 g/mol = 0.1 moles Or 0.1 moles of NaCl molecules.

Each NaCl molecule has 2 ions, one Na+ cation and one Cl- anion.

Hence total moles of ions = 0.1 × 2 = 0.2 moles

Number of ions = 0.2 × 6.022 × 10²³

= 1.2042 × 10²³ ions

OR

(a) Soap solution is a heterogeneous mixture while the rest are of homogeneous nature.

(b) The two components of a colloidal solution are the dispersed phase and the dispersion medium. For example, a colloidal solution of starch in water (Starch acts as a dispersed phase and water as the dispersion medium).