Chemistry Answers

Write the mechanism of chlorination of phenol

Carbonyl fluoride, COF

2

COF2, is an important intermediate used in the production of fluorine-containing compounds. For instance, it is used to make the refrigerant carbon tetrafluoride, CF

4

CF4 via the reaction

The Haber process for the synthesis of ammonia from nitrogen and hydrogen gases in an exothermic process.

N2(g) + 3H2(g) ⇌ 2 NH3 (g) ΔHrxn= -92.4 kJ

How will the following conditions affect the equilibrium of the system?

a) adding more N₂ =

b) removing 3H₂    =

c) removing NH₃    =

d) increasing the pressure in the reaction vessel   =

e) decreasing the temperature of the system        =

An empty 1.0 L was filled with 5.0 moles of oxygen and 4.0 moles of nitrogen monoxide. If the amount of NO₂ at equilibrium is 1.5 moles, calculate the equilibrium constant, Kc.

2NO(g)  + O₂(g)     ⇌     2 NO₂ (g)           

For the reaction CH4(g)  +2H2S(g) ⇌  CS2(g)  + 4H2(g)  , Kc = 0.046 at 687oC. In an experiment, 4.00 mol of CH4, 1.00 mol of H2S, 2.00mol of CS2, and 2.00 mol of H2 are mixed in a 500mL vessel. Is the reaction at equilibrium? If not, in which direction is it progressing?

Calculate the value of equilibrium constant Kc when:

a.    N₂ reacts with O₂ to produce NO. At equilibrium, the concentrations of each gas were found to be N₂= 0.45M, O₂= 0.88M, and NO= 0.98M.   N₂ + O₂  ⇌ 2NO

b.    N₂ reacts with H₂ to produce NH₃. At equilibrium, the concentrations were N₂=0.12M, H₂= 0.20M, and NH₃= 0.55M.  N₂ + 3H₂  ⇌ 2NH₃

What is the limiting reactant

An ideal gas undergoes a mechanically reversible

process (constant pressure, constant

temperature and adiabatic process. The gas entering a T1=650K and P1=10bar decreases its temperature at constant pressure where V2=2.91x10^-3 m^-3. Then, it went to isothermal process to decrease its pressure. Finally, the gas returns to its initial state. Take CP = 7/2 and CV = 5/2R.

a. T2, P3, V1and V3

b.Q,W,ΔU and ΔH

Electrochemical cells are constructed using different electrodes in Fe2+/Fe3+ (1M

electrolyte as shown in the figure below. Draw the Cyclic Voltammogram in a voltage range of 0-0.8V and describe the current contributions in cyclic voltammogram from each of the following electrodes:

find the concentration of calcium ion in (in ppm) in a 3.50-g pill that contains 40.5 mg of CA