Chemistry Matter and Change

Thandi Buthelezi, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom, Dinah Zike

Chapter 24 Nuclear Chemistry - all with Video Answers

Educators

+ 3 more educators

Chapter Questions

00:37

Problem 1

List the different types of radiation and their charges.

Amy Jiang

Numerade Educator

00:37

Problem 2

Compare the subatomic particles involved in nuclear and chemical reactions.

Matthew Confer

Numerade Educator

00:28

Problem 3

Explain how you know whether the reaction is chemical or nuclear when an
atom undergoes a reaction and attains a more-stable form.

Amy Jiang

Numerade Educator

01:20

Problem 4

Calculate Table 24.2 gives approximate energy values in units of MeV. Convert
each value into joules using the following conversion factor:
IMeV $=1.6 \times 10^{-13} \mathrm{J}$

Matthew Confer

Numerade Educator

07:10

Problem 5

Summarize Make a time line that summarizes the major events that led to the understanding of alpha, beta, and gamma radiation.

Anupam Ojha

Numerade Educator

00:43

Problem 6

Write a balanced nuclear equation for the reaction in which oxygen-15
undergoes positron emission.

Matthew Confer

Numerade Educator

00:29

Problem 7

Thorium- 229 is used to increase the lifetime of fluorescent bulbs. What
type of decay occurs when thorium-229 decays to form radium-225?

Ronald Prasad

Numerade Educator

01:57

Challenge The figure at right shows one way that bismuth-212 can decay,
producing isotopes A and B.
a. Write a balanced nuclear equation for this decay.
b. Identify the isotopes $A$ and $B$ that are produced.

Matthew Confer

Numerade Educator

01:02

Problem 9

Bandages can be sterilized by exposure to gamma radiation from cobalt--60, which has a
half-life of 5.27 y. How much of a 10.0 -mg sample of cobalt--60 is left after one half-life?
Two half-lives? Three half-lives?

Anthony Han

Numerade Educator

01:02

Problem 10

If the passing of five half-lives leaves 25.0 $\mathrm{mg}$ of a strontium-90 sample, how much was
present in the beginning?

Matthew Confer

Numerade Educator

03:10

Problem 11

Challenge The table shows the amounts of radioisotopes in three different samples.
To the nearest gram, how much will be in Sample $\mathrm{B}$ and Sample $\mathrm{C}$ when Sample $\mathrm{A}$
has 16.2 $\mathrm{g}$ remaining?

Amy Jiang

Numerade Educator

01:04

Problem 12

Describe what happens to unstable nuclei.

Matthew Confer

Numerade Educator

00:17

Problem 13

Explain how you can predict whether or not an isotope is likely to be stable if
you know its number of neutrons and protons.

Amy Jiang

Numerade Educator

01:19

Problem 14

Describe the forces acting on the particles within a nucleus and explain why
neutrons are the glue holding the nucleus together.

Matthew Confer

Numerade Educator

00:44

Problem 15

Predict the nuclear equation for the alpha decay of radium- 226 used on the tips
of older lighthing rods.

Amy Jiang

Numerade Educator

00:56

Problem 16

Calculate how much of a 10.0 -g sample of americium-241 remains after four
half-lives. Americium- 241 is a radioisotope commonly used in smoke detectors
and has a half-life of 430 y.

Matthew Confer

Numerade Educator

02:00

Problem 17

Calculate After 2.00 y, 1.986 g of a radioisotope remains from a sample that
had an original mass of 2.000 $\mathrm{g} .$
a. Calculate the half-life.
b. How much of the radioisotope remains after 10.00 y?

Ronald Prasad

Numerade Educator

02:01

Problem 18

Graph A sample of polonium-214 originally has a mass of 1.0 $\mathrm{g}$ . Express
the mass remaining as a percent of the original sample after a period of one,
two, and three half-lives. Graph the percent remaining versus the number of
half-lives. Approximately how much time has elapsed when 20$\%$ of the original
sample remains?

Matthew Confer

Numerade Educator

01:13

Problem 19

Write the balanced nuclear equation for the induced transmutation of
alluminum-2 7 into sodium-24 by neutron bombardment. An alpha particle
is released in the reaction.

Amy Jiang

Numerade Educator

01:21

Problem 20

Write the balanced nuclear equation for the alpha-particle bombardment
of $^{239} \mathrm{Pu}$ One of the reaction products is a neutron.

Matthew Confer

Numerade Educator

02:55

Problem 21

Challenge Archeologists sometimes use a procedure called neutron
activation analysis to identify elements in artifacts. The figure at right
shows one type of reaction that can occur when an artifact is bombarded
with neutrons. If the product of the process is cadmium-110, what was
the target and unstable isotope? Write balanced nuclear equations
for the process to support your answer.

David Collins

Numerade Educator

01:58

Problem 22

Compare and contrast nuclear fission and nuclear fusion reactions. Describe the particles that are involved in each type of reaction and the changes they undergo.

Matthew Confer

Numerade Educator

00:46

Problem 23

Describe the process that occurs during a nuclear chain reaction and explain
how to monitor a chain reaction in a nuclear reactor.

Amy Jiang

Numerade Educator

01:49

Problem 24

Explain how nuclear fission can be used to generate electric power.

Matthew Confer

Numerade Educator

02:15

Problem 25

Formulate an argument supporting or opposing nuclear power as your state's
primary power source. Assume the primary source of power currently is the burning of fossil fuels.

David Collins

Numerade Educator

01:12

Problem 26

Calculate What is the energy change $(\Delta E)$ associated with a change in mass
$(\Delta m)$ of 1.00 $\mathrm{mg}$ ?

Matthew Confer

Numerade Educator

01:46

Problem 27

Interpret Graphs Use the graph in Figure 24.14 on page 877 to answer
the following questions.
a. Why is the isotope 56 fe highest on the curve?
b. Are more stable isotopes located higher or lower on the curve?
c. Compare the stability of Li-6 and He-4.

David Collins

Numerade Educator

01:14

Problem 28

Explain one way in which nuclear chemistry is used to diagnose or
treat disease.

Matthew Confer

Numerade Educator

00:35

Problem 29

Describe several methods used to detect and measure radiation.

Amy Jiang

Numerade Educator

01:11

Problem 30

Explain why it is safe to use radioisotopes to diagnose medical problems.

Matthew Confer

Numerade Educator

00:13

Problem 31

Calculate A lab worker receives an average radiation dose of 21 mrem each
month. Her allowed dose is $5,000$ mremly. On average, what fraction of her
yearly dose does she receive?

Amy Jiang

Numerade Educator

00:46

Problem 32

Calculate A lab worker receives an average radiation dose of 21 mrem each
month. Her allowed dose is $5,000$ mremly. On average, what fraction of her
yearly dose does she receive?

Matthew Confer

Numerade Educator

01:51

Problem 33

Interpret Data Look at the data in Table $24.7 .$ Suppose someone is exposed
to the maximum values listed for average annual radiation from the ground,
from buildings, and from the air. What fraction would the person receive of the
minimum dose $(25$ rem $)$ that causes a temporary decrease in white blood cell
population?

David Collins

Numerade Educator

00:39

Problem 34

Compare and contrast chemical reactions and nuclear
reactions in terms of energy changes and the particles
involved.

Matthew Confer

Numerade Educator

00:34

Problem 35

$\begin{array}{ll}{\text { Match each numbered choice on the right with the }} \\ {\text { correct radiation type on the left. }} \\ {\text { a. alpha }} & {\text { 1. high-speed electrons }} \\ {\text { b. beta }} & {\text { 2. } 2+\text { charge, blocked easily }} \\ {\text { c. gamma }} & {\text { 3. no charge, electromagnetic radiation }}\end{array}$

Amy Jiang

Numerade Educator

00:59

Problem 36

Figure 24.30 shows alpha particles, beta particles, and
gamma rays passing through a screen and between two
charged plates. What can you infer about the identity of
$\mathbf{a}, \mathbf{b},$ and $c ?$ Explain your answer.

Matthew Confer

Numerade Educator

00:21

Problem 37

What is the difference between $X$ rays and gamma rays?

Amy Jiang

Numerade Educator

00:52

Problem 38

Dental crown Uranium-234 is used to make dental
crowns appear brighter. The alpha decay of uranium-
234 produces what isotope?

Matthew Confer

Numerade Educator

02:05

Problem 39

Detecting Material Flaws Flaws in welded metal parts
of airplanes can be identified by placing the isotope iridium-192 on one side of the weld and photographic film
on the other side to detect gamma rays that pass
through. How does the gamma ray emission affect the
atomic number and mass number of the iridium?

Madi Sousa

Numerade Educator

00:56

Problem 40

Colored Glass Thorium $-230$ can be used to provide
coloring in glass objects. One method of producing
thorium- 230 is through the radioactive decay of
actinium-230. Is this an example of alpha decay or beta
decay? How do you know?

Matthew Confer

Numerade Educator

03:55

Problem 41

Plastic Bags Thin sheets of plastic are used to make
items such as grocery bags. The sheets move under a
source of promethium-147, emitting beta particles. The
radiation intensity, measured under the plastic sheets, is
used to monitor the thickness of the plastic. During this
process, promethium changes into which element?

Alexander Fenton

Numerade Educator

01:09

Problem 42

What is the strong nuclear force? On which particles
does it act?

Matthew Confer

Numerade Educator

00:18

Problem 43

Explain the difference between positron emission and
electron capture.

Amy Jiang

Numerade Educator

01:22

Problem 44

Categorize each type of radioactive decay.
a. Mass number and atomic number are unchanged.
b. Mass number remains the same and atomic number
decreases.

Matthew Confer

Numerade Educator

00:35

Problem 45

What is the significance of the band of stability?

Amy Jiang

Numerade Educator

00:53

Problem 46

What is a radioactive decay series? When does it end?

Matthew Confer

Numerade Educator

02:03

Problem 47

Radioisotopes What are the factors that determine the
amount of a given radioisotope in nature?

David Collins

Numerade Educator

01:11

Problem 48

In which region(s) in Figure 24.31 are you likely to find
a. stable nuclei?
b. nuclei that undergo alpha decay?
c. nuclei that undergo beta decay?
d. nuclei that undergo positron emission?

Matthew Confer

Numerade Educator

00:47

Problem 49

Carbon-14 Dating Carbon-14 dating makes use of a
specific ratio of two different radioisotopes. Define the
ratio used in carbon- 14 dating. Why is this ratio constant in living organisms?

Amy Jiang

Numerade Educator

01:15

Problem 50

Calculate the neutron-to-proton ratio for each atom.
$\begin{array}{ll}{\text { a. } \operatorname{tin}-134} & {\text { c. carbon-12 }} \\ {\text { b. silver-107 }} & {\text { d. carbon-1 } 4}\end{array}$

Matthew Confer

Numerade Educator

01:43

Problem 51

Complete the following equations.
$$_{83}^{214} \mathrm{Bi} \rightarrow_{2}^{4} \mathrm{He}+? \quad \text { b. }^{239} \mathrm{Np} \rightarrow_{94}^{239} \mathrm{Pu}+?$$

Amy Jiang

Numerade Educator

View

Problem 52

Write a balanced nuclear equation for the alpha decay of
americium-241.

Daphne G. Moore

Numerade Educator

01:03

Problem 53

Write a balanced nuclear equation for the beta decay of
cesium-137.

Amy Jiang

Numerade Educator

00:29

Problem 54

Bone Formation The electron capture of strontium-85
can be used by physicians to study bone formation.
Write a balanced nuclear equation for this reaction.

Matthew Confer

Numerade Educator

02:07

Problem 55

Nuclear mishap The half-life of tritium $\left(3^{3} \mathrm{H}\right)$ is 12.3 $\mathrm{y}$ .
If 48.0 $\mathrm{mg}$ of tritium is released from a nuclear power
plant during the course of a mishap, what mass of the
nuclide will remain after 49.2 y? After 98.4 y?

Amy Jiang

Numerade Educator

01:08

Problem 56

Static Charge Static charge can interfere with the production of plastic products by attracting dust and dirt.
To reduce it, manufacturers expose the area to polonium- $210,$ which has a half-life of 138 days. How much of
a 25.0 -g sample will remain after one year ( 365 days)?

Matthew Confer

Numerade Educator

02:08

Problem 57

The half-life of polonium-218 is 3.0 $\mathrm{min.}$ If you start
with 20.0 $\mathrm{g}$ , how long will it be before only 1.0 $\mathrm{g}$
remains?

Amy Jiang

Numerade Educator

01:44

Problem 58

An unknown radioisotope exhibits 8540 decays per second. After 350.0 min, the number of decays has
decreased to 1250 per second. What is the half-life?

Matthew Confer

Numerade Educator

00:30

Problem 59

Define transmutation. Are all nuclear reactions also
transmutation reactions? Explain.

Amy Jiang

Numerade Educator

00:32

Problem 60

Relate binding energy per nucleon to mass number.

Matthew Confer

Numerade Educator

00:41

Problem 61

Referring to Figure $24.7,$ would you expect $\frac{30}{20}$ Ca to be
radioactive? Explain.

Amy Jiang

Numerade Educator

01:11

Problem 62

What is a chain reaction? Give an example of a nuclear
chain reaction.

Matthew Confer

Numerade Educator

00:26

Problem 63

Explain the purpose of control rods in a nuclear reactor.

Amy Jiang

Numerade Educator

00:44

Problem 64

Why is the fuel of a nuclear reactor enriched?

Matthew Confer

Numerade Educator

00:35

Problem 65

Describe what is meant by the terms critical mass,
subcritical mass, and supercritical mass. Which is
shown in Figure 24.327 How can you tell?

Amy Jiang

Numerade Educator

01:07

Problem 66

Explain how it is possible that fission, the splitting of
nuclei, and fusion, the combining of nuclei, both release
tremendous amounts of energy.

Matthew Confer

Numerade Educator

00:09

Problem 67

Describe the current limitations of fusion as a power
source.

Amy Jiang

Numerade Educator

01:26

Problem 68

Why does nuclear fusion require so much heat? How is
heat contained within a tokamak reactor?

Matthew Confer

Numerade Educator

01:26

Problem 69

Smoke Detectors Americium-241, a radioisotope used
in smoke detectors, is produced by bombarding plutonium- 238 with neutrons to produce plutonium-240, which
is bombarded with neutrons to produce plutonium-241.
The plutonium- 241 decays to americium-241. Write the
balanced nuclear equations for each reaction.

Madi Sousa

Numerade Educator

00:50

Problem 70

Exit signs Exit signs are coated with a paint containing
phosphors. These phosphors are activated by the radio-
isotope tritium $(3 \mathrm{H})$ , produced by bombarding lithium-6
with neutrons to produce lithium-7. The lithium- 7 then
undergoes alpha decay to produce the tritium. Write
balanced nuclear equations for both steps.

Matthew Confer

Numerade Educator

00:37

Problem 71

Control Rods Bombarding uranium $-235$ with neutrons
produces samarium-149, which is used in nuclear reactor control rods. What other element is produced?

Amy Jiang

Numerade Educator

02:19

Problem 72

The Sun $_{1}^{1} \mathrm{H}+_{1}^{2} \mathrm{H} \rightarrow_{2}^{3} \mathrm{He}+\gamma$ is one of the fusion
reactions in the Sun. The mass of $_{1}^{1} \mathrm{H}$ is 1.007825 amu,
the mass of $_{1}^{2} \mathrm{H}$ is 2.014102 amu, and the mass of $_{2}^{3} \mathrm{He}$ is
3.016029 amu.
a. What is the mass deffect of $_{2}^{3} \mathrm{He?}$
b. What energy is released by the process?

Matthew Confer

Numerade Educator

00:09

Problem 73

What property of isotopes allows radiotracers to be
useful in studying chemical reactions?

Amy Jiang

Numerade Educator

00:32

Problem 74

Which unit of radiation dose, rem or rad, is most useful
for describing the effect of radiation on living tissue?

Matthew Confer

Numerade Educator

00:41

Problem 75

PET scans In PET scans, the radiotracer emits positrons, which travel a few millimeters before interacting with electrons. How can the original radiotracer be
detected?

Amy Jiang

Numerade Educator

00:50

Problem 76

Figure 24.33 shows a simplified graph of radiation
intensity versus distance from the source. Explain this
graph and what itimplies about a method of reducing
the effects of radiation exposure.

Matthew Confer

Numerade Educator

00:48

Problem 77

Figure 24.34 shows the position of two workers near a
radioactive gamma source. The worker at Position A is
standing 2.5 $\mathrm{m}$ from the source and receives an exposure
of 0.98 mrem $/ \mathrm{s} \cdot \mathrm{m}^{2} .$ The worker at Position $\mathrm{B}$ receives
an exposure of 0.50 $\mathrm{mrem} / \mathrm{s} \cdot \mathrm{m}^{2} .$ What is the distance
of the worker at Position $\mathrm{B}$ from the source?

Amy Jiang

Numerade Educator

01:12

Problem 78

A worker stands near a machine that uses a cobalt-60
gamma source to sterilize medical equipment. The worker's dose 2.0 $\mathrm{m}$ from the source is 0.85 $\mathrm{mrem} / \mathrm{s} \cdot \mathrm{m}^{2}$ .
What is the worker's dose at a distance of 3.5 $\mathrm{m} ?$

Matthew Confer

Numerade Educator

01:32

Problem 79

Safe Exposure The intensity of a radioactive source is
1.15 mrem/s*m $^{2}$ at a distance of 0.50 $\mathrm{m} .$ What is the
minimum distance a person could be from the source to
have a maximum exposure of 0.65 $\mathrm{mrem} / \mathrm{s} \cdot \mathrm{m}^{2} ?$

David Collins

Numerade Educator

00:54

Problem 80

Technetium-104 has a half-life of 18.0 min. How much of
a 165.0 g sample remains after 90.0 minutes have passed?

Matthew Confer

Numerade Educator

01:08

Problem 81

A bromine- 80 nucleus can decay by gamma emission,
positron emission, or electron capture. What is the
product nucleus in each case?

Amy Jiang

Numerade Educator

01:07

Problem 82

The half-life of plutonium-239 is $24,000$ y. How much
nuclear waste generated today will remain in 1000 years?

Matthew Confer

Numerade Educator

01:41

Problem 83

Red blood cells A medical researcher is using a chromium-51 source to study red blood cells. The gamma-emission intensity at a distance of 1.0 $\mathrm{m}$ is 0.75 $\mathrm{mrem} / \mathrm{s} * \mathrm{m}^{2}$ . At what distance would the intensity drop to 0.15 mrem $/$
$\mathrm{s} \cdot \mathrm{m}^{2}$ ?

David Collins

Numerade Educator

00:44

Problem 84

The binding energy per nucleon reaches a maximum
around what mass number? Explain how this number is
related to the fission and fusion processes.

Matthew Confer

Numerade Educator

00:24

Problem 85

You have an alpha source, a beta source, and a gamma
source. Design a plan to use a Geiger counter, paper, and
foil to determine the identity of each source.

Amy Jiang

Numerade Educator

01:28

Problem 86

What is the half-life of radon-222 if a sample initially
contains 150 $\mathrm{mg}$ and only 18.7 $\mathrm{mg}$ after 11.4 days?

Matthew Confer

Numerade Educator

00:27

Problem 87

Sheet metal A company plans to monitor the thickness
of sheet metal during production. What would you recommend the company do to determine a safe distance for workers from the gamma source?

Amy Jiang

Numerade Educator

00:55

Problem 88

Figure 24.35 shows part of the decay series of a radioisotope. For each segment on the graph, tell whether alpha decay or beta decay occurs, and identify the
change in atomic number and mass number.

Matthew Confer

Numerade Educator

03:53

Problem 89

Make and Use Graphs Thorium-2 31 decays to lead-
207 by emitting the following particles in successive steps: $\beta, \alpha, \alpha, \beta, \alpha, \alpha, \alpha, \beta, \beta, \alpha .$ Plot each step of the
decay series on a graph of mass number versus atomic
number. Label each plotted point with the symbol of the
radioisotope.

David Collins

Numerade Educator

01:01

Problem 90

Apply Chemical treatment is often used to destroy
harmful chemicals. For example, bases neutralize acids.
Why can't chemical treatment be applied to destroy the
fission products produced in a nuclear reactor?

Matthew Confer

Numerade Educator

00:49

Problem 91

Compare A biological concern about working around
some radioactive materials is the radioactive dust a person might inhale. Compare the effect of alpha radiation
outside the body and inside the body.

Amy Jiang

Numerade Educator

00:47

Problem 92

Interpret Small radioactive sources are often used for
laboratory experiments. The radioactive substance is
enclosed in a metal container with a small window. A gamma source might be covered with a stainless steel window. What would you expect the window of an alpha
source to be like? Why?

Matthew Confer

Numerade Educator

00:30

Problem 93

Analyze Some radioisotopes used for medical imaging
have half-lives as short as several hours. Why is a short
half-life beneficial? Why is it a problem?

Amy Jiang

Numerade Educator

01:22

Problem 94

Infer The production of electricity at nuclear fission
reactor facilities is controversial. Think about the benefits and dangers of this technology. Explain your opinion about whether nuclear reactors should be used.

Matthew Confer

Numerade Educator

02:35

Problem 95

Use the information in Table 24.8 to calculate the mass
defect and binding energy of deuterium $\left(_{1}^{2} \mathrm{H}\right),$ a hydrogen isotope involved in fusion reactions in the Sun.
a. Find the mass of the nucleons.
b. Find the mass defect by subtracting the mass of the
nucleons from the mass of the deuterium.
c. Find the binding energy using the conversion
1 amu $=931.49 \mathrm{MeV} .$

Madi Sousa

Numerade Educator

01:25

Problem 96

Identify each property as chemical or physical.
(Chapter 3)
a. The element mercury has a high density.
b. Solid carbon dioxide sublimes at room temperature.
c. Zinc oxidizes when exposed to air.
d. Sucrose is a white crystalline solid.

Matthew Confer

Numerade Educator

00:34

Problem 97

Why does the second period of the periodic table
contain eight elements? (Chapter 6$)$

Amy Jiang

Numerade Educator

01:22

Problem 98

Draw each molecule and show the locations of hydrogen
bonds between the molecules. (Chapter 8$)$
a. two water molecules.
b. two ammonia molecules
c. one water molecule and one ammonia molecule

Matthew Confer

Numerade Educator

00:48

Problem 99

What process takes place in each situation? (Chapter 12$)$
a. a solid air-freshener cube getting smaller and smaller
b. dewdrops forming on leaves in the morning
c. steam rising from a hot spring
d. a crust of ice forming on top of a pond

Amy Jiang

Numerade Educator

01:38

Problem 100

If the volume of a sample of chlorine gas is 4.5 $\mathrm{L}$ at 0.65 atm
and $321 \mathrm{K},$ what volume will the gas occupy at STP?
(Chapter 13$)$

Matthew Confer

Numerade Educator

00:56

Problem 101

The temperature of 756 $\mathrm{g}$ of water in a calorimeter
increases from $23.2^{\circ} \mathrm{C}$ to $37.6^{\circ} \mathrm{C}$ How much heat was
given off by the reaction in the calorimeter?
(Chapter 15)

Amy Jiang

Numerade Educator

01:12

Problem 102

Explain what a buffer is and why buffers are found in
body fluids. (Chapter 18)

Matthew Confer

Numerade Educator

00:43

Problem 103

Explain how the structure of benzene can be used to
explain its unusually high stability compared to other
unsaturated cyclic hydrocarbons. (Chapter 21$)$

Amy Jiang

Numerade Educator

02:28

Problem 104

Marie Curie and Irene Curie Joliot Research and
report on the lives of Marie Curie and her daughter,
Irene Curie Joliot. What kind of scientific training did
each receive? What was it like to be a female chemist
in their time? What discoveries did each make?

Madi Sousa

Numerade Educator

02:23

Problem 105

Nuclear Waste Evaluate environmental issues
associated with nuclear wastes. Research the Yucca
Mountain nuclear waste disposal plan, the Hanford
nuclear site, or a local nuclear facility. Prepare a
poster site, or a local nuclear facility. Prepare a

David Collins

Numerade Educator

03:03

Problem 106

Radioactive Sources Students in your school might
not realize how beneficial radioactive sources can be.
Create a poster showing some common, beneficial
uses of radioactive sources. Be sure to point out safeguards that are taken to ensure the sources are safe.

Madi Sousa

Numerade Educator

01:25

Problem 107

Fluorine-18 is used in medical imaging. If a lab has
a sample containing 15 g of fluorine-18, how much
fluorine- 18 will remain in the sample after 8.0 h?

Amy Jiang

Numerade Educator

01:12

Problem 108

Technetium-99 can be used for diagnostic tests of the
heart and lungs. Because of technetium-99's very
short half-life, medical facilities produce it from
molybdenum-99. If the facility has a 25 -g sample of
molybdenum-99, how much will it have one week
$(168$ h) later?

Matthew Confer

Numerade Educator

01:04

Problem 109

Samarium- 153 is used in the production of a drug
to treat pain from bone tumors. Radiation released
by the samarium hinders the tumor growth, thereby
reducing pain. How much of a 1.0 $\mathrm{g}$ sample of
samarium-153 is left after 4 days $(96 \mathrm{h})$ ?

Amy Jiang

Numerade Educator