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Integrated Rate Law

Q. In the first order decomposition of N2H4 at 740 K, it is found that 18% of a sample has decomposed in 16.9 minutes. How long will it take for 50.0% of the sample to decompose?

Solved • May 6, 2020

Integrated Rate Law

Q. Given: 4PH3(g)  P4(g) + 6H2(g) rate = k[PH3] If the rate constant is 0.0278 s–1, calculate the percent of the original PH3 which has reacted after 76.0 s.

Solved • Apr 12, 2020

Integrated Rate Law

Q. The following reaction, 2A → B is first order in A and has a rate constant, k, of 7.5 × 10−3 s−1 at 110°C. With a starting concentration of [A] = 1.65 M, what will [A] be after 2.5 min?

Solved • Apr 10, 2020

Integrated Rate Law

Q. In the parts that follow, use the following abbreviations for time 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 41.0 % of an Am-241 sample to decay? Express your answer with the appropriate units.

Solved • Apr 6, 2020

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 50.0 g of the substance is currently present, what mass A0 was present 8.00 hours ago? Express your answer with the appropriate units.

Solved • Apr 6, 2020

Integrated Rate Law

Q. If you accidentally spill phosphorus-32 onto your shoe, how long would it take before 99.9 % of the radioactive material has decayed so that you can safely wear shoes again? Express your answer as an integer.

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 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 35.0 % of an Am-241 sample to decay? Express your answer with the appropriate units.

Solved • Mar 16, 2020