Chemical Kinetics

 12) (a) C₂H₄(g) + 3O₂(g) 2CO₂(g) + 2H₂O(g)

             Rate = -Δ[C₂H₄]/Δt = 0.23 M/s

             Rate = -Δ[C₂H₄]/Δt = 1/2 Δ[CO₂]/Δt = 0.23 M/s

             Rate = Δ[CO₂]/Δt = 2 x 0.23 M/s = 0.46 M/s

             Rate = -Δ[C₂H₄]/Δt = 1/2 Δ[H₂O]/Δt = 0.23 M/s

             Rate = Δ[H₂O]/Δt = 2 x 0.23 M/s = 0.46 M/s

       (b) N₂H₄(g) + H₂(g) 2NH₃(g)

             Rate = -ΔP_N2H4/Δt = 45 torr/hr

             Rate = -ΔP_N2H4/Δt = 1/2 ΔP_NH3/Δt = 45 torr/hr

             Rate = ΔP_NH3/Δt = 2 x 45 torr/hr = 90 torr/hr

             Rate = -ΔP_N2H4/Δt = -ΔP_H2/Δt = -45 torr/hr

             ΔP_T/Δt = 90 torr/hr - 45 torr/hr - 45 torr/hr = 0 torr/hr