Lexan is a plastic used to make compact discs, eyeglass lenses, and bullet-proof glass. one of the compounds used to make lexan is phosgene (cocly), an extremely poisonous gas. phosgene decomposes by the reaction coch(o) co(g)+cla (9) for which k, 6.8 x 10- at 100°c. if pure phosgene at an initial pressure of 4 8 atm decomposes, calculate the equilibrium pressures of all species partial pressure of coch- partial pressure of co- partial pressure of cla atm atm atm

p[CO] = 1.81*10⁻⁴ atm

p[Cl2] =  1.81*10⁻⁴ atm

p[COCl2]  = 4.8 atm

Explanation:

Given:

Pressure of phosgene, COCl2 = 4.8 atm

Kp = 6.8*10^-9

To determine:

The equilibrium partial pressures of COCl2, Cl2, CO

Calculation:

Set-up an ICE table for the given reaction:

I                 4.8                 0   0

C              -x                    +x   +x

E              (4.8-x)              x     x          

The equilibrium partial pressures are:

p[CO] = x = 1.81*10⁻⁴ atm

p[Cl2] = x = 1.81*10⁻⁴ atm

p[COCl2] = 4.8-x =4.8- 1.81*10⁻⁴ atm = 4.8 atm

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.