Consider the following system at equilibrium where H° = 111 kJ/mol, and Kc = 6.30, at 723 K.2NH3(g) N2(g) + 3H2(g)If the TEMPERATURE on the equilibrium system is suddenly increased:The value of Kc A. increases.  B. decreases.  C. remains the same. The value of Q A. is greater than Kc.  B. is equal to Kc.  C. is less than Kc. The reaction must: A. run in the forward direction to reestablish equilibrium.  B. run in the reverse direction to reestablish equilibrium.  C. remain the same. It is already at equilibrium. The concentration of H2 will: A. increase.  B. decrease.  C. remain the same.

Question
Asked Sep 24, 2019
3 views

Consider the following system at equilibrium where H° = 111 kJ/mol, and Kc = 6.30, at 723 K.

2NH3(g) N2(g) + 3H2(g)

If the TEMPERATURE on the equilibrium system is suddenly increased:

The value of Kc   A. increases.
    B. decreases.
    C. remains the same.

 

The value of Q   A. is greater than Kc.
    B. is equal to Kc.
    C. is less than Kc.

 

The reaction must:   A. run in the forward direction to reestablish equilibrium.
    B. run in the reverse direction to reestablish equilibrium.
    C. remain the same. It is already at equilibrium.

 

The concentration of H2 will:   A. increase.
    B. decrease.
    C. remain the same.
check_circle

Expert Answer

Step 1

The given problem can be solved by the use of Le Chatelier’s principle. Le Chatelier’s principle states that “ If a reaction is applied to some external disturbance it attempts to maintain equilibrium by opposing the change.”

Given that,

ΔH0 = 111 kJ/mol.

Kc = 6.30.

Since the given value of the enthalpy is positive,  the reaction is endothermic. To favor the reaction in the forward direction the heat should be added in the system.

On the equilibrium system, if the temperature is increased suddenly, the forward reaction is favored because the heat is added in the system. Kc will increase with an increase in temperature and decrease with a decrease in temperature for endothermic reactions.

Since the forward reaction is favored, the Kc value increases. Consequently, product concentration increases while reactant concentration decreases.

Thus, the option (A) is correct.

Step 2

Since the initial concentration of the reactant was greater than that of the present concentration, the value of Qc is less than Kc.

Thus, option (C) is correct.

Step 3

The reaction must run in the forward direction to re-establis...

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in

Science

Chemistry

Related Chemistry Q&A

Find answers to questions asked by student like you

Show more Q&A add
question_answer

Q: 138. You have two rigid gas cylinders. Gas cylinder A has a volume of 48.2 L and contains N2(g) at 8...

A: Given:Volume of gas (VN2) = 48.2 L.Pressure of gas (PN2) = 8.35 atm.Temperature of gas (TN2) = 25℃ =...

question_answer

Q: Consider the following equations. HOCl  H+ + OCl - K = 3.0 ✕ 10-8 HOCl + OBr -  HOBr + OCl - K...

A: Equilibrium constant of a reaction is the measure of extent to which reactants are converted into pr...

question_answer

Q: A sample of vegetable oil with density 911 kg/m3911 kg/m3 is found to have a mass of 34.3 g.34.3 g. ...

A: Density is a physical quantity that can be determined with the help of the mass and volume of the gi...

question_answer

Q: What is the mass of KNO3 in the original 247g mixture of KNO3 BaCl2 and NaCl

A: A 247.0 g of sample is given which is a mixture of KNO3, BaCl2 and NaCl.Now this sample is divided i...

question_answer

Q: Match the statements 1-3 with a-d 1. They have the same shape 2.The maximum number of electrons is t...

A: (1)The shape of the s orbitals is spherical and p orbitals have a dumbbell shape. The orbitals with ...

question_answer

Q: double replacement: NiCl2(aq) +NaOH(aq)----->__________+__________a salt formed with the Ni and t...

A: A salt formed with the Ni and the hydroxide anion will usually precipitate, while all salts formed w...

question_answer

Q: Why a piece of wood is a mixture?

A: Wood is a substance made up of cellulose, hemicelluloses, and lignin.

question_answer

Q: Auto Tutored Practice Problem 15.3.4 cOUNTS TOWARDS GRADE Close Problem Use K and initial concentrat...

A: Given:T = 284 KK = 6.18 X 10-2Conc. Of NO = 0.226 MWe need to calculate the equilibrium concentratio...

question_answer

Q: If a human consumes about 1.9 L of water a day, how many kilograms of Epsomite ((MgSO4)(7H2O)) would...

A: Given,Consumes water per day = 1.9 LHuman consumes water per day = 1.9 L,For seven days = 1.9 L × 7F...