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miguelmike2895
19.02.2020 •
Chemistry
Chromium has an atomic mass of 51.9961 u and consists of four isotopes, 50 Cr , 52 Cr , 53 Cr , and 54 Cr . The 52 Cr isotope has a natural abundance of 83.79 % and an atomic mass of 51.9405 u. The 54 Cr isotope has a natural abundance of 2.37 % and an atomic mass of 53.9389 u. The natural abundances of the 50 Cr and 53 Cr isotopes exist in a ratio of 0.4579 : 1 , and the 50 Cr isotope has an atomic mass of 49.9460 u. Determine the atomic mass of the 53 Cr isotope. atomic mass of 53 Cr:.
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Ответ:
Answer : The atomic mass of
isotope is 52.8367 amu
Explanation :
We know that:
Total percentage abundance of the isotope = 100 %
Percentage abundance of![_{24}^{50}\text{Cr}\text{ and }_{24}^{53}\textrm{Cr}\text{ isotopes}=[100-(83.79+2.37)]=13.84\%](/tpl/images/0515/1858/e24f2.png)
We are given:
Ratio of
isotopes = 0.4579 : 1
Percentage abundance of
isotope = ![\frac{0.4579}{(0.4579+1)}\times 13.84\%=4.37\%](/tpl/images/0515/1858/80d4d.png)
Percentage abundance of
isotope = ![\frac{1}{(0.4579+1)}\times 13.84\%=9.49\%](/tpl/images/0515/1858/c917f.png)
Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.
Formula used to calculate average atomic mass follows:
.....(1)
Let the mass of
isotope be 'x'
For
isotope:
Mass of
isotope = 49.9460 amu
Percentage abundance of
= 4.37 %
Fractional abundance of
isotope = 0.0437
For
isotope:
Mass of
isotope = 51.9405 amu
Percentage abundance of
isotope = 83.79 %
Fractional abundance of
isotope = 0.8379
or
isotope:
Mass of
isotope = x amu
Percentage abundance of
isotope = 9.49 %
Fractional abundance of
isotope = 0.0949
For
isotope:
Mass of
isotope = 53.9389 amu
Percentage abundance of
isotope = 2.37 %
Fractional abundance of
isotope = 0.0237
Average atomic mass of chromium = 51.9961 amu
Putting values in equation 1, we get:
Hence, the atomic mass of
isotope is 52.8367 amu
Ответ:
Criteria for the implementation of drinking water:
where drinking water comes from and its qualitytechnical interventionhygiene education for communityregulations, laws and managementsroutine water sampling and analysisLimitations:
availability of resources (human, finance, equipment)geographical conditionsclimatological conditionscommunity and authority and transport infrastructureExplanation:
For more information:
https://www.who.int/water_sanitation_health/dwq/gdwqvol32ed.pdf?ua=1https://www3.epa.gov/region1/eco/drinkwater/your_drinkwater_source.html