Question

1.

In order to study hydrogen halide decomposition, a researcher fills an evacuated 1.79 L flask with 0.222 mol of HI gas and allows the reaction to proceed at 436°C: 2HI (g)  ⇋  H₂(g) + I₂(g)

At equilibrium, the concentration of HI = 0.09 M. Calculate K_c. Enter to 4 decimal places.

HINT: Look at sample problem 17.6 in the 8th ed Silberberg book. Write a K_c expression. Find the initial concentration. Fill in the ICE chart. Put the E (equilibrium) values into the K_c expression.

2.

In a study of the conversion of methane to other fuels, a chemical engineer mixes gaseous methane and gaseous water in a 0.398 L flask at 1,170 K. At equilibrium, the flask contains 0.114 mol of CO gas, 0.238 mol of H₂ gas, and 0.153 mol of methane. What is the water concentration at equilibrium (Kc = 0.30 for this process at 1,170 K)?

Enter to 4 decimal places.

HINT: Look at sample problem 17.7 in the 8th ed Silberberg book. Write a balanced chemical equation. Write the K_c expression. Calculate the equilibrium concentrations of all the species given (moles/liter). Put values into K_c expression, solve for the unknown.

3. Look at sample problem 17.10 in the 8th edition Silberberg book. The research and development unit of a chemical company is studying the reaction of methane and H2S, two components of natural gas: CH4 (g) + 2 H2S (g) ⇋ CS2 (g) + 4 H2 (g) In one experiment, 1.5 mol of CH4, 1.5 mol of CS2, 2.5 mol of H2S, and 2.5 mol of H2 are mixed in a 200. ml vessel at 960°C. At this temperature, Kc = 0.064. In which direction will the reaction proceed to reach equilibrium? Enter right, left, at equilibrium, If the concentration of methane at equilibrium is 10.0 M, what is the equilibrium concentration of H2? Enter a number to 1 decimal place. (MTS 5/16/2018)

Answer 1

Answer 1

Answer 2

Answer 3