The following Kinetic data were collected for the decomposition of nitrosyk brom
ID: 942409 • Letter: T
Question
The following Kinetic data were collected for the decomposition of nitrosyk bromide: 2NOBr(g) right arrow 2NO(g)+Br_2(g) nitrosyl bromide nitric oxide bromine Using Excel, plot three functions of the data to determine the rate law and determine k from the proper plot. R^2 must be included on the trendline to be able to make the correct choice. Do not forget significant figures (3, do not simply accept what Excel spits out) and proper units on k. Note: H_2O is not part of the rate law because its concentration does not change.Explanation / Answer
Let us assume that the rate of the reaction is zero order
[Ao] = [At] + kt
0.298 = 0.274 + k(39)
k = 6.153 * 10^(-4)
0.274 = 0.251 + k(80-39)
k = 0.023/41 = 5.609 * 10^(-4)
Since reaction rate is not constant, hence the reaction is not zero order
Let us assume that the rate of the reaction is first order
ln(Ao/At)= kt
ln(0.298/0.274) = k(39)
k = 2.152 * 10^(-3)
ln(0.274/0.251) = k(80-39)
k = 2.138 * 10^(-3)
Since reaction rate is almost constant, hence the reaction is first order
Let us assume that the rate of the reaction is second order
1/[At] = 1/[Ao] + kt
1/0.274 = 1/0.298 + k(39)
k = 7.53 * 10^(-3)
1/0.251 = 1/0.274 + k(80-39)
k = 8.156 * 10^(-3)
Since reaction rate is not constant, hence the reaction is not second order
Hence the reaction is second order wrt NOBr, the graph of ln(A) versus time will yield a straight line