For the reactionso2(g) + no2(g) so3(g) + no(g), the equilibrium constant is 18.0 at 1,200ºc. if 2.0 moles of so2 and 2.0 moles of no2 are placed in a 20. l container, what concentration of so3 will be present at equilibrium?
a) 0.081 mol/l
b) 0.019 mol/l
c) 0.11 mol/l
d) 1.00 mol/l
e) 18 mol/l

Answer : The correct option is, (A) 0.081 mol/L

Explanation : Given,

Equilibrium constant = 18.0

Initial concentration of =

Initial concentration of =

The balanced equilibrium reaction is,

Initial conc.    0.1          0.1             0             0

At eqm.        (0.1-x)     (0.1-x)          x             x

The expression of equilibrium constant for the reaction will be:

Now put all the values in this expression, we get :

By solving the term 'x' by quadratic equation, we get two value of 'x'.

From this we conclude that, the value of x = 0.131 at equilibrium can not be more than the initial concentration. So, the value of 'x' which is equal to 0.131 M is not consider.

The concentration of at equilibrium = x = 0.081 M

Therefore, the concentration of at equilibrium is, 0.081 M

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

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