Consider the HF solution with the concentration of 5%(w/v). You can convert the % concentration into the molarity.

Question

a) Assume that you have 100ml of this solution. Determine the number of moles of HF if the concentration of HF is given as 5%(w/v)
For this part I did
5% is 5g
5gHF in 100ml, (am I suppose to convert 100 ml, if yes to what pls)
then molar mass of HF is 20g/mol
am i dividing half of 100 with the molar mass or what do I do


b) Determine the molarity of HF by using the moles of HF from question (a) and the volume of the solution that you assumed in (a)

Answer 1

a. mols HF = grams/molar mass = 5/20 = ? about 0.25 mols

b.
Then M = mols/L = 0.25 mols/0.1 L = ?