Question

A) The equilibrium between carbon dioxide gas and carbonic acid is very important in biology and environmental science.

Answer 1

Answer:

Explanation:

CO₂ (aq) + H₂O (l)   ⇄   H₂CO₃ (aq)

Equilibrium constant

Kc  =   [H₂CO₃] / [CO₂] [H₂O]

B )

PCl₃(g) + Cl₂(g)    <-->   PCl₅(g)

Kc = 24.3 .

[PCl₃] = .10M ,

[Cl₂] = 0.15 M

[PCl₅]  = 0.60 M.

Qc =  [PCl₅]  /  [PCl₃] [Cl₂]

= .60 / .10 x .15

= 40

Qc > Kc

Hence the reaction will proceed from left to right to reach equilibrium . It is so because the product concentration is more .

Option C is the right choice .