Answer:
The concentration of the HF solution: M = 4.25 M
Explanation:
Molarity, denoted by M, is the molar concentration of a given solution. It is the ratio of number of moles of solute and the total volume of the solution in L.
Molarity of a solution is given by,
[tex]M = \frac{Number\: of\: moles\: of \: solute\: (n)}{Total\: volume\: of\: the\: solution\: (V)(in\: L)}[/tex]
and, [tex]n = \frac{Given\: mass\: of\: solute\: (w)}{Molar\: mass\: of\: solute\: (m)}[/tex]
Given: Total volume of solution: V = 2 × 10² mL = 2 × 10² × 10⁻³ L = 0.2 L (∵ 1 mL = 10⁻³ L)
Given mass of solute (HF): w = 17 g, Molar mass of solute (HF): m = 20 g/mol
Molarity of HF solution: M = ?
So the number of moles of solute (HF):
[tex]n = \frac{w}{m} = \frac{17\: g}{20\: g/mol} = 0.85\: mol[/tex]
Therefore, the Molarity of the HF solution:
[tex]M = \frac{n}{V(in\: L)} = \frac{0.85\: mol}{0.2\: L} = 4.25\: mol/L\: or\: 4.25\: M[/tex]
Therefore, the concentration of the HF solution: M = 4.25 M
