The answer are provided. I'm just having trouble with rate law and rate constant, especially question 3.
QUESTION 1: Consider the reaction:
2NO(g) + O2(g) ?2NO2(g)
If the instantaneous rate of reaction of nitric oxide (NO) is -0.016 M/s, at what rate is molecular oxygen reacting
A) 0.016 M/s B) 0.032 M/s C) 0.008 M/s D) +0.016 M/s E) +0.032 M/s
QUESTION 2: 222Ra is a naturally occurring radioisotope that can build up in homes. Calculate the rate constant for the first-order decay of 222Ra. ( t1/2 = 3.30 x 105 s) A) 2.29 x 105 s-1 B) 2.1 x 10-6 s-1 C) 12.7 s-1 D) 3.03 x 10-6 s-1 E) 4.37 x 10-6 s-1
QUESTION 3: The reaction of NO2 and CO to produce NO and CO2 is known to occur through a two-step mechanism:
k1
Step 1: NO2 + NO2 ? NO + NO3
k2
Step 2: NO3 + CO ? NO2 + CO2
Rate = k[NO2]2 In the overall reaction the coefficient for NO2 is ___ and the rate determining step is___.
A) 1 ; Step 1 B) 2 ; Step 1 C) 1 ; Step 2 D) 2 ; Step 2 E) 1 ; rds Cannot be determined