Answer:
1.4 * 10^-3
Explanation:
The equilibrium expression can be written as follows:
Keq = P [HD]^2/[ P[H2] * P[D2]]
Where P is pressure
1.80= (2.7 * 10^-3)^2 / ( 1.1 * 10^-3 * P[H2])
P[H2] = [2.7 * 10^-3]^2 / [1.8 * 1.1 * 10^-3]
P[H2] = 1.4 * 10^-3 atm