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(a) The molar mass of 144 Nd is 144 g/mol. A sample of ¹44 Nd has a mass of 53.94 g and emits an average of 2.36 a particles per second. Calculate the half-life of the sample. (b) A sample of radioactive material has an initial activity of 135.0 decays/minute. After 5 days 7 hours, its activity is 84.5 decays/minute. Calculate the time (after t = 0) it will take for the sample to reach an activity of 10.0 decays/minute.

(a) The molar mass of 144 Nd is 144 g/mol. A sample of ¹44 Nd has a mass of 53.94 g and emits an average of 2.36 a particles per second. Calculate the half-life of the sample. (b) A sample of radioactive material has an initial activity of 135.0 decays/minute. After 5 days 7 hours, its activity is 84.5 decays/minute. Calculate the time (after t = 0) it will take for the sample to reach an activity of 10.0 decays/minute.

Chemistry & Chemical Reactivity
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter25: Nuclear Chemistry
Section25.4: Rates Of Nuclear Decay
Problem 25.5CYU
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Question 3 (a) The molar mass of 144 Nd is 144 g/mol. A sample of 144 Nd has a mass of 53.94 g and emits an average of 2.36 a particles per second. Calculate the half-life of the sample. (b) A sample of radioactive material has an initial activity of 135.0 decays/minute. After 5 days 7 hours, its activity is 84.5 decays/minute. Calculate the time (after t = 0) it will take for the sample to reach an activity of 10.0 decays/minute.
Transcribed Image Text:Question 3 (a) The molar mass of 144 Nd is 144 g/mol. A sample of 144 Nd has a mass of 53.94 g and emits an average of 2.36 a particles per second. Calculate the half-life of the sample. (b) A sample of radioactive material has an initial activity of 135.0 decays/minute. After 5 days 7 hours, its activity is 84.5 decays/minute. Calculate the time (after t = 0) it will take for the sample to reach an activity of 10.0 decays/minute.
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