2. Hydrogen fluoride can be produced from elemental fluorine and hydrogen according to the reaction H2(g) + F2(g)  2HF(g). The reaction has an equilibrium constant, Kc, of 7.75 x 10 2 at a certain temperature. a. Calculate the equilibrium concentration of HF(g) if 5.750 mol of H2 and F2 are introduced into a 1.500 L flask.

The equilibrium concentration of HF is 7.15 M.

Explanation:

Molarity is calculated by using the equation:

Moles of Hydrogen gas = 5.750 moles

Volume of container = 1.500 L

Moles of fluorine gas = 5.750 moles

Volume of container = 1.500 L

For the given chemical equation:

Initially

3.833 M    3.833 M        0

At equilibrium:

(3.833-x) M   (3.833-x) M     2x

The expression of an equilibrium constant will be given as:

Solving for x:

x = 3.576 M

The equilibrium concentration of HF :

i believe the answer is 5,000