Chemistry Practice Problems The Reaction Quotient Practice Problems Solution: Which of the following statements regarding equili...

Solution: Which of the following statements regarding equilibrium is/are correct?I If Q > Keq, the reaction must shift toward reactants to be at equilibriumII A reversible reaction is at equilibrium when the rates of forward and reverse reactions are equalIII For the reaction CaO(s) + CO2(g) ⇌ CaCO3(s), Kp has units of atm-1A. All statements are correctB. Only statements I and II are correctC. Only statements II and III are correctD. Only statement II is correctE. None of the statements is correct

Problem

Which of the following statements regarding equilibrium is/are correct?

I If Q > Keq, the reaction must shift toward reactants to be at equilibrium

II A reversible reaction is at equilibrium when the rates of forward and reverse reactions are equal

III For the reaction CaO(s) + CO2(g) ⇌ CaCO3(s), Kp has units of atm-1

A. All statements are correct

B. Only statements I and II are correct

C. Only statements II and III are correct

D. Only statement II is correct

E. None of the statements is correct

Solution

We're being asked to identify which of the following statements regarding equilibrium is/are correct.

I. If Q > Keq, the reaction must shift toward reactants to be at equilibrium
II. A reversible reaction is at equilibrium when the rates of forward and reverse reactions are equal
III. For the reaction CaO(s) + CO2(g) ⇌ CaCO3(s), Kp has units of atm
-1


Let's analyze each statement given:

I. If Q > Keq, the reaction must shift toward reactants to be at equilibrium

Depending on if Q is greater than or less than K our reaction will shift to attain equilibrium by reaching the equilibrium constant K:

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