Organic Chemistry Answers

For the reaction 2 NO + CL2 -> 2 NOCL at 25 *C equilibrium is established when [NOCL] =2.6M, [NO] =1.4 M and [CL2] = 0.34M. What is the equilibrium constant for this reaction

Show the mechanism for the following reactions:
A) propanol and sulfuric acid
B) first step: butyl alcohol and sodium hydride →In the second reaction use the product from the first step and react it with propyl chloride.
C)Using 2-methyl-2-butanol perform the following steps: Step 1 –mercuric acetateand ethanolStep 2 –sodium borohydride.

Show the full mechanisms for the following reactions:
a) 2-methyl-2-butanol reacting with HCl
b) Isopentyl alcohol reacting with HBr
c)Pentyl alcohol reacting with HCl/ZnCl2
d)Neohexyl alcohol reacting with SOCl2 and pyridine
e)tert-bentyl alcohol reacting with concentrated sulfuric acid and heat
f) sec-butyl alcohol reacting with phosphorus oxychloride and pyridine

A calormeter has a mass of 200g and a specific heat capacity of 0.420 J g-¹. Into it are put 50.0 cm³ of 1.25 mol dm-³ hydrochloric acid and 50.0cm³ of 1.25 mol dm-³ potassium hydroxide solution at the same temperature. The temperature of the calorimeter and contents rises by 10.0⁰C. Calculate the standard enthalpy of normalization.


Assume the specific heat capacity of all solutions is 4.18 J g-¹ K-¹ and the density of all solutions is 1 g cm-³

Mean bond enthalpies: C=C 612kJ/mol, C-C 348 kJ/mol, C-HkJ/mol, H-H 436kJ/mol, C(s) —> C(g) 715kJ/mol

1 - Calculate the enthalpy change for the dimerisation of ethene to give cyclobutane


2 C2H4(g) —> C4H8(g)



2 - Given that the mean enthalpy of the C-C and C-H bonds in cyclobutane are in fact 320kJ/mol and 412kJ/mol respectively, calculate the standard enthalpy of formation of cyclobutane.

The standard enthalpy of formation of H2O (l) is -286 kJ/mol and the standard enthalpy of combustion of ethane is -1560 kJ/mol. Given that the enthalpy change when one mole of ethene is redcued by hydrogen gas to ethane is - 138kJ/mol, calculate the standard enthalpy of combustion of ethene.

Several ammount of unknown salt was added to a solvent. Initial amount of solvnet is 30 ml. When the mixture weighed 0.2202 lb, undissolved salts were observed. Upon seperation of the salts, it was found to be around 5 g. What is the solubility of the unknown salt? Before seperating the undissolved solute from the mixture, was the solution supersaturated and why? (Density of the solvent=1.02 g/mL)

An unknown salt is added continously to water until salt is no longer dissolved. Initially, the water weighs 50 g. When the mixture reached 65 g, salt can no longer be dissoleved. What is the saturation concentration of the salt in g/L?

A certain compound has a solubility of 169 g/L in a solvent.If the mixture contains 50 g of solute in a 300 cubic cm of solution, is the solution unsaturated? If yes, how many grams of solute should be added to make a saturated solution?