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Given the equation representing a chemical reaction at equilibrium in a sealed, rigid container:H2(

June 2017 NY Regents Chemistry Exam


42 Given the equation representing a chemical reaction at equilibrium in a sealed, rigid container: H2(g) + I2(g) + energy --> 2HI(g) When the concentration of H2(g) is increased by adding more hydrogen gas to the container at constant temperature, the equilibrium shifts

(1) to the right, and the concentration of HI(g) decreases

(2) to the right, and the concentration of HI(g) increases

(3) to the left, and the concentration of HI(g) decreases

(4) to the left, and the concentration of HI(g) increases




Solution: When there is too much hydrogen gas, equilibrium will shift to the opposite side to get rid of it. Hydrogen gas is on the left. So equilibrium will shift to the right increasing the concentration of HI.

Answer: 2


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