Organic Chemistry Answers

The reaction of carbon disulfide with chlorine is as follows: CS2 (g) + 3 Cl2 (g) ⇋ CCl4 (g) + S2Cl2 (g) H = -238 kJ

Predict the effect of the following changes to the system on the direction of equilibrium.

a. The pressure on the system is doubled by halving the volume.

b. CCl4 is removed as it is generated.

c. Heat is added to the system.

A hypothetical acid HA has a dissociation constant 1.8 𝑥 10ିଷ.

a. Write a balanced dissociation reaction of the acid

b. Write the equilibrium constant expression for the acid

c. If the initial concentration of the acid is 0.5 M, determine its hydrogen ion concentration. d. Calculate the ionization constant

e. Comment on the strength of the acid

A buffer solution is prepared by mixing sodium acetate (CH3COONa) in acetic acid (CH3COOH). Using equations of relevance explain how the prepared solution serves as a buffer. 

Sketch the following galvanic cell. Identify the cathode and anode and show the direction of electron flow. Write the oxidation and the reduction half reaction.

Cu2+ (aq) + Mg (s) → Mg2+ (aq) + Cu (s)

Determine the overall cell reaction and the E°cell for the following galvanic cell: Al3+ (aq) + Mg(s) → Al(s) + Mg2+ (aq)

The Standard Reduction Potentials are:

Al3+ + 3e- → Al E° = -1.66 V

Mg2+ + 2e- → Mg E° = -2.37 V

Calculate the ∆H for the synthesis of diborane from its elements, according to the equation: 2B(s) + 3H2(g) → B2H6(g)

Using the following data: ∆H (KJ)

2B(s) + 3/2 O2 (g) → B2O3 (s) -1273

B2H6 (g) + 3O2(g) → B2O3 (s) + 3H2O (g) -2035

H2 (g) + ½ O2(g) → H2O (l) -286

H2O (l) → H2O (g) 44 

Using the given reaction, answer the given questions: 2H2(g) + O2(g) → 2H2O(l) ∆H = -572 KJ

a. How much heat is liberated for the production of 1.00 mol of H2O(l)?

b. Determine the heat evolved when 4.13 g of hydrogen is reacted with excess oxygen.

c. Determine the amount of heat liberated when 190 g of oxygen is reacted with excess hydrogen. 

Name the following coordination compounds.

a. K2[PtCl4]

b. [Cr(H2O)5Br] Br2

Write the formula for the coordination compounds given:

a. Potassium hexafluorocobaltate (III)

b. Triamminebromoplatinum (II) chloride 

Draw structures of following compounds:

a. 1-chloro-2,2-dimethylbutane

b. Trans-1,2-dichloroethene