A 17.0-g sample of hf is dissolved in water to give 2.0 x 10 2 ml of solution. the concentration of the solution is:

Molar concentration is the number of moles of solute dissolved in 1 L of solution

the mass of HF dissolved - 17.0 g

molar mass of HF - 20 g/mol

number of moles of HF = mass dissolved / molar mass

number of moles of HF = 17.0 g / 20 g/mol = 0.85 mol

volume of solution is 200 mL

number of HF moles in 200 mL = 0.85 mol

therefore number of HF moles in 1000 mL is - 0.85 mol/200 x 1000 = 4.25 mol/L

molar concentration of HF solution is 4.25 M