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26 May, 16:49

The reaction 2 ClO2 (g) + F2 (g) → 2 FClO2 (g) is first-order in both ClO2 and F2. When the initial concentrations of ClO2 and F2 are equal, the rate after 25% of the F2 has reacted is what percent of the initial rate? 1. 37.5% 2. 18.8% 3. 75.0% 4. 28.1% 5. 12.5%

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  1. 26 May, 19:41
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    3. 75.0%

    Explanation:

    2 ClO2 (g) + F2 (g) → 2 FClO2 (g)

    First order with respect to ClO2 and F2.

    This means the rate equation is given as;

    Rate = k [ClO2][F2]

    When the initial concentrations of ClO2 and F2 are equal?

    Let's assume an initial value of 1 for both reactants, so rate equation is given as;

    Rate = k * 1 * 1 = k

    The rate after 25% of the F2 has reacted is what percent of the initial rate?

    The concentration left of F2 is 75% (100% - 25%) = 0.75

    Concentration of ClO2 remains 1.

    So rate equation is given as;

    Rate = k * 1 * 0.75 = 0.75 k

    Comparing 0.75k and k.

    This means our answer is;

    3. 75.0%
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