Question

Question #46d57

Answer 1

The formality is 0.0200 mol/L.

Explanation:

The formality `F` of a solution is the number of moles `n` of the ionic solute dissolved in one litre of the solution.

`color(blue)(bar(ul(|color(white)(a/a)F = "moles"/"litres" = n/Vcolor(white)(a/a)|)))" "`

`n = 2.02 color(red)(cancel(color(black)("g KNO"_3))) × ("1 mol KNO"_3)/(101.10 color(red)(cancel(color(black)("g KNO"_3)))) = "0.020 00 mol KNO"_3`

`V = "1 L"`

∴ `F = "0.020 00 mol"/"1 L" = "0.0200 mol/L"`