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2 August, 09:21

Consider the combustion of ethylene, C2H4 (g) + 3O2 (g) →2CO2 (g) + 2H2O (g). If the concentration of C2H4 is decreasing at the rate of 3.8*10-2 M/s, what is the rate of change in the concentration of CO2? Express your answer using two significant figures. Δ[CO2]/Δt Δ [ C O 2 ] / Δ t = nothing M/s

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  1. 2 August, 11:39
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    0.076 M/s

    Explanation:

    The rate of a reaction aA + bB → cC + dD can be calculated by:

    r = - (1/a) x (Δ[A]/Δt) = - (1/b) x (Δ[B]/Δt) = (1/c) x (Δ[C]/Δt) = (1/d) x (Δ[D]/Δt)

    The minus signal for the reactants is because they're disappearing, so Δ{A] and Δ[B] will be negative. So, for the same time, r is proportional to the coefficients:

    r = (1/2) Δ[CO₂]/Δt

    Δ[CO₂]/Δt = 2x3.8x10⁻²

    Δ[CO₂]/Δt = 0.076 M/s
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