Question

If 18.7 grams of an aqueous solution of ammonium fluoride, NH4F, contains 1.26 grams of ammonium fluoride, what is the

percentage by mass of ammonium fluoride in the solution?

Answer 1

The percentage by mass of ammonium fluoride in the solution : 6.738%

Further explanation

Given

18.7 g of NH4F solution

1.26 g NH4F

Required

The percentage by mass

Solution

`\tt \%mass=(mass~solute)/(mass~solution)* 100\%`

mass solute = mass Ammonium fluoride

mass solute = 1.26 g

mass solution = 18.7 g

Input the value :

`\tt \%mass=(1.26)/(18.7)* 100\%\\\\\%mass=6.738`