GIVE AN EXAMPLE OF AVERAGE ATOMIC MASS WITH CALCULATIONs
Answers
Lithium, Sodium, and Pottasium.
where atomic mass of Li, Na and K are 6.9, 23 and 39 respectively.
So add 6.9 and 39 you will get 45.9 which is approximately equal to the atomic mass of sodium.
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calculate the average mass, first convert the percentages into fractions (divide them by 100). Then, calculate the mass numbers. The chlorine isotope with 18 neutrons has an abundance of 0.7577 and a mass number of 35 amu. To calculate the average atomic mass, multiply the fraction by the mass number for each isotope, then add them together.
Average atomic mass of chlorine = (0.757735 amu) + (0.242337 amu) = 35.48 amu
Another example is to calculate the atomic mass of boron (B), which has two isotopes: B-10 with 19.9% natural abundance, and B-11 with 80.1% abundance. Therefore,
Average atomic mass of boron = (0.19910 amu) + (0.80111 amu) = 10.80 amu
Whenever we do mass calculations involving elements or compounds (combinations of elements), we always use average atomic masses.
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