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Q3. The half-life of a rection was calculated at 300 seconds. What % of starting material...
70. The half-life of cobalt-60 is 5.3 years. What percent of a sample of cobal:-60 will remain after 21.2 years? A) 50% B) 40% C) 12.5% D) 10% E) 6.25%
1. The half-life for a reaction is 726 seconds. Starting with a concentration of 0.600 M, what will the concentration be after 1452 seconds if the reaction is first order? Enter your answer 2. How long will it take for the concentration to reach 0.100 M? Enter your answer 3.A first-order reaction has a half-life of 76.2 minutes. How long will it take for the concentration to decrease to 6.25% (1/16) of its original value? Enter your answer 4. The...
Assuming it reacts following first order kinetics, what percentage of a material will persist after 60 minutes if its half-life is 20 minutes? 33% 6.25% 12.5% 25% 50%
For the first order process: A → B The half-life of A is 62.1 seconds. If a sample of A initially has 250.0 g, what mass (in g) of A will remain after 149.2 seconds?
For the first order process: A → B The half-life of A is 62.1 seconds. If a sample of A initially has 250.0 g, what mass (in g) of A will remain after 84.2 seconds?
Fluorine-21 has a half-life of approximately 5 seconds. What fraction of original nuclei would remain after 1 minute?
13) Fluorine-21 has a half-life of approximately 5 seconds. What fraction of original nuclei would remain after 1 minute? (6 points)
91. If the half – life of a sample of radioactive material is 60 days, what fraction of the original radioactive nuclei will remain after 120 days.
Calculate the half-life of the paint (in seconds). What is the intensity of the light at the 2nd half-life? What is the intensity of the light at the 3rd half-life? The following data were collected for a phosphorescent paint being proposed for use in coating highways. Time Intensity (s) (lux) 10 1528 20 768 386 194 97 49 25 12 6 30 40 50 60 70 80 90 100
A First-Order reaction has a half-time(half-life) of 25 seconds. The approximate time required for the reaction to be 75% complete is A) 50s B)37.5s C)100s D)75s E)none of these