Question

At a certain temperature and a total pressure of ${10}_5$ Pa, iodine vapours contain $40\%$ by volume of iodine atoms
$\left[I_2\right(g)\leftrightharpoons 2I(g\left)\right].K_p$ for the equilibrium will be

• A. 0.67
• B. 1.5
• C. 2.67 x 10⁴
• D. 9.0 x 10⁴

Answer 1

The correct option is C 2.67 x 10⁴

Partial pressure of I atoms
$\left(p_l\right)=40\times {10}^5/100Pa=0.4\times {10}^{5}Pa$
Partial pressure of $l_2\left(p_2\right)=60\times {10}^5/100Pa=0.6\times {10}^{5}Pa$
$K_p=(p_1{)}^2/p_2=(0.4\times {10}^5{)}^2/(0.6\times {10}^5)=2.67\times {10}^4$