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# Chemistry Equilibrium question? (Urgent!!)?

1.) 2.00 mol of hydrogen gas and 2.00 mol of chlorine gas are used in a 10.0 L container during the synthesis of gaseous Hydrochloric Acid. If the equilibrium constant of the reaction is Keq = 5.00, determine the equilibrium amounts of all the compounds in the reaction.

H2(g) + Cl2(g) ⇄ 2HCl(g)

Could you find the amount in grams of each compound? I found the concentration for all but I don't know how to find the grams of each compound.

### 1 Answer

- hcbiochemLv 74 weeks ago
First, the product of this reaction is not hydrochloric acid, but is hydrogen chloride. Hydrochloric acid is a solution of this compound in water.

Keq = [HCl]^2/[H2][Cl2] = 5.00

................[H2]......[Cl2]......[HCl]

Initial.........0.2.......0.2..........0

Change.....-x..........-x.........+2x

Equilib....0.2-x.....0.2-x......2x

Keq = 5.00 = (2x)^2 / (0.2-x)^2

Begin by taking the square root of both sides to give:

2.236 = 2x / (0.2-x)

0.4472 - 2.236x = 2x

0.4472 = 4.236x

x = 0.106

[H2] = [Cl2] = 0.2 - x = 0.094 M

[HCl] = 2x = 0.212 M