Posted: November 28th, 2015

Chemistry

Chemistry

16

1.)    For the reaction below, the following data were obtained at a constant temperature:

4 A (g) + 3 B (g) ? 2 C (g)

Trial    Initial Rate (mol/L•min)    Initial [A]
(mol/L)    Initial [B]
(mol/L)
1    1.29 x 10-29    1.00    0.100
2    1.33 x 10-30    0.100    0.100
3    1.30 x 10-29    0.100    1.00
4    1.32 x 10-31    0.100    0.0100

a.    What is the rate law for the formation of C?
b.    Calculate the average value of the rate constant.

Chapter 17

2.)    Nitrogen dioxide decomposes according to the following reaction.

2 NO2 (g) ? 2 NO (g) + O2 (g)        Kp = 4.48 × 10-13
If 0.75 atm of NO2 is added to a container and allowed to come to equilibrium, what are the equilibrium pressures of NO and O2?

3.)    Sodium bicarbonate undergoes thermal decomposition according to the reaction
2NaHCO3(s) ? Na2CO3(s) + CO2(g) + H2O(g)

How does the equilibrium position shift as a result of each of the following disturbances?
a.    0.20 atm of argon gas is added.
b.    NaHCO3 is added.
c.    Mg(ClO4)2 is added as a drying agent to remove H2O.
d.    Dry ice is added at constant T.

Chapter 18

4.)    Acetic acid has a Ka of 1.8 x 10-5, and ammonia has a Kb of 1.8 x 10-5.
Find [H3O+], [OH-], pH, and pOH for:
a.    0.240 M acetic acid.
b.    0.240 M ammonia.

Chapter 19

5.)    What are the [H3O+] and pH of a benzoic acid-benzoate buffer that consist of 0.33 M C6H5COOH and 0.28 M C6H5COONa? (Ka of benzoic acid = 6.3 x 10-5)

6.)    A buffer that contains 0.110 M weak acid HY and 0.220 M weak base Y- has a pH of 8.77. What is the pH after 0.0020 moles of NaOH are added to 0.500 L of this buffer?

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