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# Using reactant reaction order to predict changes in initial rate?

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- Dr WLv 74 weeks ago
the general rate equation would look like

.. rate = k * [N2]² * [H2]²

the ² is the order of each.. .[ ] is concentration in molarity

so for two reactions we can write

.. rate #1 = k * [N2 #1]² * [H2 #1]²

.. rate #2 = k * [N2 #2]² * [H2 #2]²

dividing the 2nd by the first

.. rate #2 / rate #1 = (k/k) * ([N2 #2] / [N2 #1])² * ([H2 #2] / [H2 #1])²

or

.. rate2 = rate1 * * ([N2#2] / [N2#1])² * ([H2#2] / [H2#1])²

plugging in your data

.. rate2 = 0234 M/s * (0.473M / 0.142M)² * (1.47M / 1.47M)²

.. rate2 = 2.60 M/s

and

.. rate2 = 0.234 M/s * (0.0467M / 0.142M)² * (4.47M / 1.47M)²

.. rate2 = 0.234 M/s

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