Chemistry Practice Problems Average Rate of Reaction Practice Problems Solution: Consider the following reaction: 2 HBr(g) → H2(g) ...

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Solution: Consider the following reaction: 2 HBr(g) → H2(g) + Br2(g)Express the rate of the reaction in terms of the change in concentration of each of the reactants and products.

Problem

Consider the following reaction: 2 HBr(g) → H2(g) + Br2(g)

Express the rate of the reaction in terms of the change in concentration of each of the reactants and products.

Solution

The rate of a chemical reaction is the speed at which the reactants are converted into products.


It is expressed as the change in concentrations of reactants or products over time.


For a hypothetical reaction:


<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>xA</mi><mo>&#x2192;</mo><mi>yB</mi></math>


The rate of reaction (in terms of A and B) is expressed as:


<math xmlns="http://www.w3.org/1998/Math/MathML"><menclose mathcolor="#0000FF" notation="box"><mi>R</mi><mi>a</mi><mi>t</mi><mi>e</mi><mo>&#xA0;</mo><mo>=</mo><mo>&#xA0;</mo><mfrac><mrow><mo>-</mo><mo>&#x2206;</mo><mfenced open="[" close="]"><mi>A</mi></mfenced></mrow><mrow><mi>x</mi><mo>&#xA0;</mo><mo>&#x2206;</mo><mi>t</mi></mrow></mfrac><mo>&#xA0;</mo><mo>=</mo><mo>&#xA0;</mo><mfrac><mrow><mo>+</mo><mo>&#x2206;</mo><mfenced open="[" close="]"><mi>B</mi></mfenced></mrow><mrow><mi>y</mi><mo>&#xA0;</mo><mo>&#x2206;</mo><mi>t</mi></mrow></mfrac></menclose></math>


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