The decomposition of nitramide in aqueous solution at 25 oc NH NO2(aq)NHo0 is fi

Question

The decomposition of nitramide in aqueous solution at 25 oc NH NO2(aq)NHo0 is first order in NH2NO2 with a rate constant of 4.70 105 s 1 If the initial concentration of NH2NO2 is 0.640 M, the concentration of NH2NO2 will be M after 33205 s have passed The rearrangement of cyclopropane to propene at 500 °c (CH)s CHyCH-CH2 is first order in (CH2)3 During one experiment it was found that when the initial concentration of (CH2)s was 3.89x102 M, the concentration of (CH2)s dropped to 1.13-102 M after 1207 s had passed. Based on this experiment, the rate constant for the reaction is -1 The decomposition of ammonia on a platinum surface at 856 °C NH3-->M2 N2 + 3/2 H2 is zero order in NH3 with a rate constant of 1.50×10-6 M s-1 If the initial concentration of NHj is 9.60 103 M, the concentration of NHj will be M after 5.06-10 seconds have passed.

Explanation / Answer

for zero order o f reaction

[A]t = [A]0 - Kt

[A]0 = 9.60 x10^-3M

k= 1.50x10^-6

t= 5.06 x103 seonds

[A] = 9.60 x10^-3 - [1.50x10^-6 x 5.06 x103]

[A]= 9.60 x10^-3 - 7.59 x10^-3

[A] = 2.01x10^-3M

Concentration of A after 5.06x10^3 seconds = 2.01 x 10^-3M.

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