Answer:
The concentration of the solution is 2.86 M
Explanation:
Molarity is a unit of concentration based on the volume of a solution. It is defined as the number of moles of solute that are dissolved in a given volume. In other words, molarity is defined as the number of moles of solute per liter of solution.
The Molarity of a solution is determined by the following expression:
[tex]Molarity (M)=\frac{number of moles of solute}{Volume}[/tex]
Molarity is expressed in units ([tex]\frac{moles}{liter}[/tex]).
In this case, you must then know the number of moles of HF, for which you must know the molar mass. Being:
the molar mass of HF is: HF= 1 g/mole + 19 g/mole= 20 g/mole
Then the following rule of three applies: if 20 g of HF are available in 1 mole, 14.3 g in how many moles will they be?
[tex]moles=\frac{14.3 g*1 mole}{20 g}[/tex]
moles= 0.715
So:
Replacing:
[tex]Molarity=\frac{0.715 moles}{0.250 L}[/tex]
Solving:
Molarity= 2.86 [tex]\frac{moler}{liter}[/tex]=2.86 M
The concentration of the solution is 2.86 M
