Potassium ion is present in foods and is an essential nutrient in the human body. One of the naturally occurring isotopes of potassium, potassium-40, is radioactive. Potassium-40 has a natural abundance of 0.0117% and a half-life of 1.28 x 10° yr. It undergoes radioactive decay in three ways: 98.2% is by electron capture, 1.35% is by beta emission, and 0.49% is by positron emission. 1. Write the nuclear equations for the three modes by which K-40 decays. 2. How many K-40 ions are present in 0.76 g of KBr? 3. How long does it take for 7.65% of K-40 in 0.76 g of KBr to undergo radioactive decay?
Potassium ion is present in foods and is an essential nutrient in the human body. One of the naturally occurring isotopes of potassium, potassium-40, is radioactive. Potassium-40 has a natural abundance of 0.0117% and a half-life of 1.28 x 10° yr. It undergoes radioactive decay in three ways: 98.2% is by electron capture, 1.35% is by beta emission, and 0.49% is by positron emission. 1. Write the nuclear equations for the three modes by which K-40 decays. 2. How many K-40 ions are present in 0.76 g of KBr? 3. How long does it take for 7.65% of K-40 in 0.76 g of KBr to undergo radioactive decay?
Introduction to General, Organic and Biochemistry
11th Edition
ISBN:9781285869759
Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Publisher:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Chapter9: Nuclear Chemistry
Section: Chapter Questions
Problem 9.88P
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Potassium ion is present in foods and is an essential nutrient in the human body. One
of the naturally occurring isotopes of potassium, potassium-40, is radioactive.
Potassium-40 has a natural abundance of 0.0117% and a half-life of 1.28 x 10' yr. It
undergoes radioactive decay in three ways: 98.2% is by electron capture, 1.35% is by
beta emission, and 0.49% is by positron emission.
1. Write the nuclear equations for the three modes by which K-40 decays.
2. How many K-40 ions are present in 0.76 g of KBr?
3. How long does it take for 7.65% of K-40 in 0.76 g of KBr to undergo radioactive
decay?
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