EQUILIBRIUM QUESTION

Question

CO2+H2=CO+H2O

CO2 H2 = CO H2O

0.5M 0.5M 0.2M 0.2M

TEMP=1200K KC=1.44 VOLUME=1.0DM3

CALCULATE MOLES AT EQUILIBRIUM.

Answer 1

CO₂ + H₂ ==> CO + H₂O

0.5 M....0.5M.....0.2M.....0.2M ARE THESE THE INITIAL CONCENTRATIONS? ASSUME THEY ARE!

Q = reaction quotient = [CO][H2O] / [CO2][H2]

Q = (0.2)(0.2) / (0.5)(0.5)

Q = 0.16 which is much less than K (1.44), so reaction will proceed toward the products:

CO₂ + H₂ ==> CO + H₂O

0.5.....0.5.......0.2.......0.2.......Initial

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

0.5-x..0.5-x...0.2+x..0.2+x...Equilibrium

Kc = 1.44 = (0.2+x)² / (0.5-x)²

Solve for x and plug into the equilibrium concentrations of the ICE table