Question

When $\Delta n=2$, the units of $K_p$ and $K_c$ are:

• A. $(atm{)}^2$, $(mole/lit{)}^2$
• B. $(atm{)}^2$, $(mole/kg{)}^2$
• C. $(atm{)}^2$, $(mole/gram{)}^2$
• D. $(mol/lit{)}^2$, $(mole/gram{)}^2$

Answer 1

Answer: (A)

$(atm{)}^2$, $(mole/lit{)}^2$

$K_p=K_c(RT{)}^{\Delta n}$

for $\Delta n=1$; $K_p$ has units of pressure i.e atm

and $K_c$ has units of concentration i.e moles/litre

for $\Delta n=2$; $K_p$ has units $at{m}^2$

and corrospondingly $K_c$ has units $(mole/litre{)}^2$