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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Chemistry

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21 February, 05:53

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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Answers (1)

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Amira Schultz · Answer 1

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%