Question

write the expression for the equilibrium constant ( k_{p} ) for the following reaction.
endlose pressures in parentheses and do not write the chemical formula as a subscript. for example, enter ( (p_{nh_{3}})^{2} ) as ( (p nh_{3})^{2} ).
if either the numerator or denominator is 1, please enter 1

( 2 fecl_{3}(s)leftrightarrow2 fecl_{2}(s)+cl_{2}(g) )

Explanation:

Step1: Recall the formula for \(K_p\)

For a reaction \(aA + bB
ightleftharpoons cC + dD\), \(K_p=\frac{(P_C)^c\times(P_D)^d}{(P_A)^a\times(P_B)^b}\), where \(P\) represents partial pressure. Solids and liquids are omitted from the \(K_p\) expression.

Step2: Apply the formula to the given reaction

In the reaction \(2FeCl_3(s)
ightleftharpoons2FeCl_2(s)+Cl_2(g)\), \(FeCl_3\) and \(FeCl_2\) are solids. So the \(K_p\) expression only includes the gas \(Cl_2\). The numerator is \((P\ Cl_2)\) (since the coefficient of \(Cl_2\) is 1) and the denominator is 1 (because there are no gaseous reactants).

Answer:

\(\frac{(P\ Cl_2)}{1}\)