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16 March, 14:22

Be sure to answer all parts. Carbon disulfide, a poisonous, flammable liquid, is an excellent solvent for phosphorus, sulfur, and some other nonmetals. A kinetic study of its gaseous decomposition reveals these dа ta: Experiment Initial [CS2] (mol/L) Initial Rate (mol/L·s) 1 0.100 2.7 * 10-7 2 0.080 2.2 * 10-7 3 0.055 1.5 * 10-7 4 0.044 1.2 * 10-7 (a) Choose the rate law for the decomposition of CS2. Rate = k k[CS2] k[CS2]2 k[CS2]3 (b) Calculate the average value of the rate constant. Enter your answer in scientific notation. * 10 s-1

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  1. 16 March, 14:39
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    Experiment Initial [CS2] (mol/L) Initial Rate (mol/L·s)

    1 0.100 2.7 * 10-7

    2 0.080 2.2 * 10-7

    3 0.055 1.5 * 10-7

    4 0.044 1.2 * 10-7

    a) Choose the rate law for the decomposition of CS2.

    Comparing equations 1 and 3, reducing the initial concentration by almost half (from 0.100 to 0.055) leads too the rate of reaction to be reduced by almost half (from 2.7 * 10-7 to 1.5 * 10-7).

    This signifies that the reaction is a first order reaction.

    Rate = k [CS2]

    (b) Calculate the average value of the rate constant.

    Taking equation 1.

    Rate = k [CS2]

    k = Rate / [CS2]

    k = 0.100 / (2.7 * 10-7) = 0.037 x 10^8 = 3.7 x 10^6s-1
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