Half-life of a first-order reaction

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What is the half-life of a first-order reaction if the rate constant is 6.2 x  10-3 s-1?

The elementary steps for the catalyzed decomposition of dinitrogen monoxide are shown below.
N2O(g) + NO(g) ® N2(g) + NO2(g)
NO2(g) ® NO(g) + 1/2 O2(g)
Which of the following statements is/are CORRECT?

1.

The overall balanced reaction is N2O(g) ® N2(g) + 1/2 O2(g).

2.

NO2(g) is a catalyst for the reaction.

3.

NO(g) is a reaction intermediate.

Given the initial rate data for nitrogen monoxide and oxygen reaction,

2 NO(g) + O2(g)  ® 2 NO2 (g)
was measured at 25 C for various concentrations of NO and O2.  Determine the rate equations from these data.  

Experiment

Conc [NO] (mol/L)

Cone [O2] (mol/L)

Initial Rate (mol/L s)

1

0.020

0.010

0.028

2

0.020

0.020

0.057

3

0.020

0.040

0.114

4

0.040

0.020

0.227

5

0.010

0.020

0.014

Which statement concerning relative rates of reaction is correct for the decomposition of phosphine?

4 PH3(g) → P4(g) + 6 H2(g)

A. The rate of disappearance of PH3 is 6/4 the rate of appearance of H2
B. The rate of appearance of P4 is equal to the rate of appearance of H2.
C. The rate of disappearance of PH3 is 1/4 the rate of appearance of P4.
D. The rate of disappearance of PH3 is 1/4 times the rate of appearance of H2.
E. The rate of appearance of H2 is 1/6 times the rate of appearance of P4

Reference no: EM13855770

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