2.The decomposition of nitrosyl bromide at 10 °C NOBrNO + ½ Br2 is second order

Question

2.The decomposition of nitrosyl bromide at 10 °C NOBrNO + ½ Br2 is second order in NOBr with a rate constant of 0.800 M-1 s-1. If the initial concentration of NOBr is 0.135 M, the concentration of NOBr will be_____________ M after 29.2 seconds have passed.

If the initial concentration of N2O5 is 0.471 M, the concentration of N2O5 will be____________ M after 347min have passed.

7.The radioisotope phosphorus-32 is used in tracers for measuring phosphorus uptake by plants. The half-life of phosphorus-32 is 14.3 days. How much time is required for the mass of a sample of phosphorus-32 to fall to 9.65percent of its original value? Since the decomposition is a radioactive decay reaction, it is first order.______________days

Explanation / Answer

Ans 1

For zero order reaction

[A0] - [A] = k*t

(8.34×10^-3 M) - (1.68×10^-3 M) = 3.40×10-6 M s-1 x t

t = 1958.82 s

the concentration of NH3 will be 1.68×10-3 M after 1958.82 seconds have passed

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