
Concept explainers
(a)
The amount of uranium dissolved in the ocean.
(a)

Answer to Problem 12P
Explanation of Solution
Given Info:
The density is 3×10−3 g/m3.
The deapth is 4×103 m.
The radius is 6.38×106 m.
Formula to calculate the amount of uranium dissolved in the ocean is,
mU=cVc(23A)hav=c(23(4πR2E))hav=8chavπR2E3
- mU is the amount of uranium dissolved
- c is the density
- V is the volume
- A is the area
- hav is the depth
- RE is the radius of Earth
Substitute 3×10−3 g/m3 for c, 4×103 m for hav and 6.38×106 m for RE to find mU.
mU=8(3×10−3 g/m3)(4×103 m)(3.14 rad)(6.38×106 m)23=4×1015 g
Thus, the amount of uranium dissolved in the ocean is 4×015 g.
Conclusion:
The amount of uranium dissolved in the ocean is 4×015 g.
(b)
The time the uranium lasts.
(b)

Answer to Problem 12P
Explanation of Solution
Given Info:
The
The percentage of isotope present is 0.70%
The energy per event 200 MeV/atoms
The rate of energy consumption is 1.5×1013 J/s
The mass per mol is 235 g/mol
Formula to calculate the amount of uranium isotope is,
m235U=ΔpmU
- m235U is the mass of isotope
- Δp is the percentage of isotope
Formula to calculate the number of atoms is,
N=NAMmolm235U=NAMmolΔpmU
- NA is the Avogadro number
- Mmol is the mass per mol
- N is the number of atoms
Formula to calculate the energy released is,
E=NE0=NAMmolΔpmUE0
- E is the energy released
- E0 is the energy released per atom
Formula to calculate the time is,
t=EP=NAMmolΔpmUE0P=NAPMmolΔpmUE0
- t is the energy released
- P is the energy released per atom
Substitute 6.02×1023 atoms/mol for NA, 0.70% for Δp, 200 MeV/atoms for E, 1.5×1013 J/s for P, 4×1015 g for mU and 235 g/mol for Mmol to find t.
t=(6.02×1023 atoms/mol)(1.5×1013 J/s)(235 g/mol)(0.70%)(4×1015 g)(200 MeV/atoms)=5×103 year
Thus, the time the uranium lasts is 5×103 year.
Conclusion:
The time the uranium lasts is 5×103 year.
(c)
The source of uranium and the possibility of renewal of the energy source.
(c)

Explanation of Solution
The uranium comes from natural resources as rocks and minerals.
The uranium comes from dissolving rock and minerals. Rivers carry such solutes into the oceans, however, the Earth’s supply of uranium is not renewable. However, if breeder reactors are used, the current ocean supply can last about a half- million years.
Conclusion:
The sources of uranium are natural sources as rocks and minerals which are not renewable.
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Chapter 30 Solutions
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