18) determine the order of the reaction with respect to Cl: zero first second th

Question

18) determine the order of the reaction with respect to Cl: zero first second third 19) A chemist monitors the decomposition of ammonia with time and plots different graphs. In INHs] versus time gave a more linear plot than either [NH.] versus time or 1//NHs] versus time From this information she is able to determine that the order of the reaction with respect to NH, is zero first second third 20) If an enzyme is added to catalyze a reaction and the enzyme lowers the energy of activation from 74 kJ/mol to 40 kJ/mol you would expect that the reaction with the catalyst would go about faster than if no catalyst 2 9 90 900 900,000 21)1 In class you observed a video of the Hindenburg Zeppelin (airship) explosion of 1937. This oscunol of the combustion of hydrogen helium lead ethanol gasoline

Explanation / Answer

19)

The rate equation for first order reaction is ,

ln (A) = ln(A)0 - kt

so, if ln (A) vs t will be straight line.

so, order of reaction is 1(first order)

20)

we know that,

k = A *exp(-Ea/RT)

k1 = A *exp(-Ea1/RT)

k2 =A *exp(-Ea2/RT)

k1/k2 = exp(-Ea1/RT) / exp(-Ea2/RT)

k1/k2 = exp (-74000/(8.314*298)) / exp (-40000/(8.314*298))

= 1.0678 x 10-13 / 9.736 x 10-8

k2 / k1 = 900000 (approx value)

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