Question

For an equilibrium change involving gaseous phase, the forward reaction is first order while the reverse reaction is second order. The unit of $K_p$ for the forward equilibrium is :

• A. $atm$
• B. ${atm}^2$
• C. ${atm}^{-1}$
• D. ${atm}^{-2}$

Answer 1

The correct option is A $atm$

$K_p=\frac{K_{Forward}}{K_{Backward}}=\frac{{\left(P_{Product}\right)}^2}{{\left(P_{Reactant}\right)}^1}$
$\therefore$ Unit of $K_p=atm$