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Integrated Rate Law

Q. In the parts that follow, use the following abbreviations for time An unknown radioactive substance has a half-life of 3.20 hours. If 33.6 g of the substance is currently present, what mass A0 was present 8.00 hours ago? Express your answer with the appropriate units.

Solved • Mar 16, 2020

Integrated Rate Law

Q. In the parts that follow, use the following abbreviations for time minutes min hours h days d years yr A fossil was analyzed and determined to have a carbon-14 level that is 60% that of living organisms. The half-life of C-14 is 5730 years. How old is the fossil? Express your answer with the appropriate units.

Solved • Mar 15, 2020

Integrated Rate Law

Q. In the parts that follow, use the following abbreviations for time minutes min hours h days d years yr Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of 432 years. How long will it take in years for 42.0 % of an Am-241 sample to decay? Express your answer with the appropriate units.

Solved • Mar 15, 2020

Integrated Rate Law

Q. In the parts that follow, use the following abbreviations for time minutes min hours h days d years yr An unknown radioactive substance has a half-life of 3.20 hours. If 16.8 g of the substance is currently present, what mass A0 was present 8.00 hours ago? Express your answer with the appropriate units.

Solved • Mar 15, 2020

Integrated Rate Law

Q. Consider the reaction below: H2CO3(aq) → CO2(aq) + H2O(l) If it has a half-life of 1.6 sec, how long will it take a system with [HCO3]0 of 2M to reach [H2CO3] of 125mM? a) 3.2 sec b) Not enough information given c) 2.9 sec d) 6.4 sec

Solved • Mar 31, 2020

Integrated Rate Law

Q. The initial concentration of the reactant A in a first-order reaction is 1.2 M. After 69.3 sec, the concentration has fallen to 0.3 M. What is the rate constant k? a) 0.2 s ^-1 b) 0.02 s^-1 c) not enough information d) 0.01 s ^-1

Solved • Mar 31, 2020

Integrated Rate Law

Q. For the reaction below: cyclobutane(g) → 2ethylene(g) at 800K, a plot of In[cyclobutane] vs t gives a straight line with a slope of -6 s^-1. Calculate the time needed for the concentration of cyclobutane to fall to 1/16 of its initial value. a) 0.63 sec b) 1.6 sec c) 1.7 sec d) 1.3 sec

Solved • Mar 31, 2020