HW04 - Predicting EQ Conc (RICE Tables)

Question 12.0 pts

Consider the reaction:

Ni(CO)4(g)  ⇌  Ni(s) + 4CO(g)

If the initial concentration of Ni(CO)4(g) is 1.0 M and x is the equilibrium concentration of CO(g), what is the correct equilibrium relation?

  1. \(\displaystyle K_c\:=\:\frac{4x}{\left(1.0\:-\:4x\right)}\)

  2. \(\displaystyle K_c\:=\:\frac{256x^4}{\left(1.0\:-\:4x\right)}\)

  3. \(\displaystyle K_c\:=\:\frac{x^5}{\left(1.0\:-\frac{\:x}{4}\right)}\)

  4. \(\displaystyle K_c\:=\:\frac{x^4}{\left(1.0\:-\frac{\:x}{4}\right)}\)


Question 22.0 pts

Suppose the reaction

H2(g) + I2(g) ⇌ 2HI(g)

has an equilibrium constant Kc = 49 and the initial concentrations of H2 and I2 is 0.5 M and of HI is 0.0M. Which of the following is the correct value for the final concentration of HI(g)?

  1. 0.219 M
  2. 0.778 M
  3. 0.250 M
  4. 0.599 M

Question 32.0 pts

The system

H2(g) + I2(g) ⇌ 2HI(g)

is at equilibrium at a fixed temperature with a partial pressure of H2 of 0.200 atm, a partial pressure of I2 of 0.200 atm, and a partial pressure of HI of 0.100 atm. An additional 0.26 atm pressure of HI is admitted to the container, and it is allowed to come to equilibrium again. What is the new partial pressure of HI?

  1. 0.360 atm
  2. 0.464 atm
  3. 0.104 atm
  4. 0.152 atm

Question 42.0 pts

At 990°C, Kc = 1.6 for the reaction

H2(g) + CO2(g) ⇌ H2O(g) + CO(g)

How many moles of H2O(g) are present in an equilibrium mixture resulting from the addition of 1.00 mole of H2, 2.00 moles of CO2, 0.75 moles of H2O, and 1.00 mole of CO to a 5.00 liter container at 990°C?

  1. 1.1 mol
  2. 1.7 mol
  3. 0.60 mol
  4. 1.0 mol

Question 52.0 pts

The system

CO2(g) + H2(g)  ⇌ H2O(g) + CO(g)

is at equilibrium at some temperature. At equilibrium, a 4.00L vessel contains 1.00 mole CO2, 1.00 mole H2, 2.40 moles H2O, and 2.40 moles CO. How many moles of CO2 must be added to this system to bring the equilibrium CO concentration to 0.669 mol/L?

  1. 0.069 moles
  2. 0.498 moles
  3. 0.993 moles
  4. 0.429 moles

Question 68.0 pts

To soften the point pain for only 6 (previous) questions, I'm throwing in this super easy 7th one worth 8 points... padding your score.

I've got a tank with a fairly decent pressure of A in it.  It reacts according to  the reaction shown:

                A(g)   ⇌  B(g)

After the reaction, half of the A has reacted. What is the value of Kp ?

  1. 0.25
  2. 2.0
  3. 0.5
  4. 4.0
  5. 1.0