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Hydrogen fluoride, HF, decomposes to produce hydrogen gas and fluorine gas. If 80.0 g of HF were initially placed in a reaction vessel, calculate the amount of HF that was left if equilibrium was reached when 2.0 g of hydrogen had been produced.

Respuesta :

Answer : The amount of HF left was, 76.0 grams.

Explanation :

The balanced chemical reaction is:

                               [tex]2HF\rightleftharpoons H_2+F_2[/tex]

Initial amount       80.0g     0g    0g

At eqm.             (80.0-2x)g   (x)g   (x)g

As we are given that:

Amount of [tex]H_2[/tex] at equilibrium = 2.0 g

That means,

x = 2.0 g

Now we have to determine the amount of HF that was left if equilibrium was reached when 2.0 g of hydrogen had been produced.

Amount of HF left = (80.0 - 2x) g

Put x = 2.0, we get:

Amount of HF left = (80.0 - 2\times 2.0) g

Amount of HF left = 76.0 g

Thus, the amount of HF left was, 76.0 grams.

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