Consider the reaction, which takes place at a certain elevated temperature CO(g)+NH3(g)⇌HCONH2(g), Kc=0.710 If a reaction vessel initially contains only CO and NH3 at concentrations of 1.00 M and 2.00 M, respectively, what will the concentration of HCONH2 be at equilibrium?

Answer : The concentration of  at equilibrium is, 0.513 M

Explanation :

The given chemical reaction is:

Initial conc.      1.00        2.00                 0

At eqm.           (1.00-x)   (2.00-x)              x

The expression for equilibrium constant is:

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

x = 0.513 and x = 3.89

We are neglecting value of x = 3.89 because equilibrium concentration can not be more than initial concentration.

Thus, the value of x will be, 0.513

The concentration of  at equilibrium is, 0.513 M

the answer is c.the valence of the atoms combine .