Use the equation to answer the question.
H2O(l) + heat ⇄ H2O(g)
A sample of water is at equilibrium at 100°C. Which statement best describes what will happen if liquid water is added to the system?

-More liquid water molecules will change to water vapor until a new equilibrium is reached.
-All of the liquid water molecules that are added will become water vapor.
-More water vapor molecules will change to liquid water until a new equilibrium is reached.
-All of the liquid water molecules that are added will remain liquid water.

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The increase in liquid water thus results in the more formation of water vapor, for reaching new equilibrium. Thus, option A is correct.

What is an equilibrium?

Equilibrium is the condition of the equal concentration of the product and reactant in the chemical equation. The reaction at equilibrium has constant rate.

The increase in the concentration of the product or reactant results in the distortion of the equilibrium condition, and the reaction will be processes in the forward or backward direction, according to equilibrium principle.

The addition of liquid water molecules to the reaction results in the increase in the concentration of the reactants. The reaction starts approaching the equilibrium until the concentration of liquid water, and gaseous water become same.

The increase in liquid water thus results in the more formation of water vapor, for reaching new equilibrium. Thus, option A is correct.

Learn more about equilibrium, here:

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