Chemistry: Equilibrium Math Question

Question

If a closed vessel is charged with 89000.0 Pa of nitric oxide and allowed to react with excess liquid bromine, what is the equilibrium partial pressure of the product?

NO(g) + ½ Br₂(l) ↔ NOBr(g) K_eq=8.504E-4

The reference pressure for K_eq is 1 bar.

Answer 1

NO(g) + ½ Br₂(l) ===> NOBr(g)

89kPa..............................0........Initial

-x...................................+x........Change

89-x...............................x..........Equilibrium

Keq = 8.504x10^-4 = P_NOBr/P_NO

8.504x10-4 = x/89-x

If we assume x is small relative to the value of 89, we can neglect it to simplify the calculation.

8.504x10^-4 = x/89

x= 0.07569 kPa = 75.7 Pa