Question

$K_{p} / K_{c}$ for the reaction $A(g)+2 B_{2}(g) \rightleftharpoons A B_{2}(g)$ is

• A. $RT$
• B. $(RT)^{2}$
• C. $\frac{1}{RT}$
• D. $\frac{1}{(RT)^{2}}$

Answer 1

Answer: (D)

$\frac{1}{(RT)^{2}}$

Answer 2

$A(g)+2B(g)\xrightarrow{{}}A{{B}_{2}}(g)$
${{K}_{p}}={{K}_{C}}{{(RT)}^{\Delta n}}_{g}$
$\Delta {{n}_{g}}=$ change in number of moles = moles of product - moles of reactant $=1-3=-2$
$\therefore$ ${{K}_{p}}={{K}_{c}}{{(RT)}^{-2}}$
$\Rightarrow$ $\frac{{{K}_{p}}}{{{K}_{C}}}=\frac{1}{{{(RT)}^{2}}}$