Question

For the reaction,
$Cu{SO}_4\cdot 5H_{2}O\left(s\right)\rightleftharpoons Cu{SO}_4\cdot 3H_{2}O\left(s\right)+2H_{2}O\left(g\right)$
which one is the correct representation?

• A. $K_p={\left[p_{H_{2}O}\right]}^2$
• B. $K_c={\left[H_{2}O\right]}^2$
• C. $K_p=K_c{\left(RT\right)}^2$
• D. All of these

Answer 1

The correct option is D All of these

For the reaction,
$Cu{SO}_4\cdot 5H_{2}O\left(s\right)\rightleftharpoons Cu{SO}_4\cdot 3H_{2}O\left(s\right)+2H_{2}O\left(g\right)$
The following are the correct representations:
$K_p={P_{H_{2}O}}^2$
$K_c={\left[H_{2}O\right]}^2$
$K_p=K_c{\left(RT\right)}^{\Delta n}=K_c{\left(RT\right)}^2$
Note: The concentrations of solids ( and pure liquids ) do not appear in the equilibrium constant expression.
$\Delta n=2=$ difference in the number of moles of gaseous products and gaseous reactants.