Organic Chemistry Answers

1. In this example we are given the partial pressure of each gas in the mixture.

2 SO 2 (g) + O 2 (g) <-> 2SO 3 (g)

The equilibrium partial pressure at constant temperature are SO 2 = 10 6 Pa, SO 3 = 8 x10 6 Pa, O 2 = 7 x 10 6 Pa. Calculate the value of Kp and its unit in Pa.

2. The equilibrium between three substances, A, B and C is shown below

A(g) + B(g) <-> C (g)

Initially there were 0/1 mol A and 0.2 mol of B in the reaction mixture. A and B reacted

together to produce an equilibrium mixture containing 0.04 mol of C. The total volume

of the mixture is 2 dm3.

a. Construct ICE table and complete it

b. Calculate the value of Kc and its unit

4. When 1 mol of N2O4 gas is allowed to come to equilibrium with NO2 gas under standard

conditions, only 20% of the N2O4 is dissociated.

N 2 O 4 (g) <-> 2 NO 2 (g)

Calculate the value of Kv . Assume the volume of the system is 1 dm3.

Although both water and methane have the same number of electron groups around the central atoms, which one has a deviation in bond angle that can't be accounted for by VSEPR theory and why?

Although both water and methane have the same number of electron groups around the central atoms, which one has a deviation in bond able that can't be accounted for by VSEPR theory?

Draw the following molecule: 7-bromo-6-ethyl-4-phenyl-trans-nonan-2-yne-5-ene

2²

Balance the redox equation:

H2S + Cr2O7^2- > S +Cr^3+ (acidic medium)

4.00×10−3 molmol of HBrHBr are dissolved in water to make 11.0 LL of solution. What is the concentration of hydroxide ions, [OH−][OH−], in this solution?

Consider the following reaction:

PCl (g)+ Cl (g)    PCl  (g) K = 4.30 x 10-6

Initially, 2.50 M PCl3 and 1.40 M Cl2 are placed into a container and allowed to reach equilibrium. Determine the equilibrium concentrations of all the species

A 6.0 grams of NaOH is dissolved in distilled water to make 1.60 - liters of solution. What is the pH of the NaOH solution?

AW Na = 23 g/mol ; AW O = 16 g/mol ;  AW H = 1 g/mol

11. Why is it not practical to use stainless steel to build structures such as bridges that are prone to corrosion?

a) Stainless steel will corrode quickly if the protective coating is broken.

b) The chromium used in stainless is too expensive.

c) Stainless steel is not strong enough.

d) The carbon used to make stainless steel is too expensive.

12. A galvanized nail is coated with what metal?

a) tin

b) chromium

c) aluminum

d) zinc

13. In the Factors that Affect Corrosion Lab what was the purpose of the layer of oil on top of the liquid in some of the experimental set-ups?

a) to coat the steel wool with a protective layer of oil

b) to prevent the water from evaporating

c) to prevent oxygen from dissolving in the water di to mix with the water to create an electrolyte solution for he redox reaction

14 Generally which of the following factors decreases the rate of iron corrosion?

a) the presence of salt

b) contact with a more reactive metal

c) acidic conditions

d) mechanical stress, such as bending