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Define the term rate expression?

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Define the term rate expression?

    • Posted by Josna Mary Thomas Thomas 6 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Yogita Ingle 6 years, 3 months ago

    Rate law

    • The representation of rate of reaction in terms of molar concentration of the reactants participating in a reaction raised to some power is called rate law.
    • It is also called rate expression or rate equation.
    • Consider a reaction:

    2NO (g) + O2 (g) --> 2NO2

    Rate ∝ [NO]2

    Rate ∝ [O2]

    Combining these two rates we derive

    Rate ∝ [NO]2 [O2]

    Rate =k [NO]2 [O2]

    • Where k is the proportionality constant with a definite value at a specific temperature for a specific reaction and is called Rate Constant.
    • Rate law expression = -d[R]/ dt = k [NO]2 [O2]

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