Chlorine has two isotopes. Chlorine-35 has an actual mass of 34.9689 u and chlorine-37 has a mass of 36.9659 u. In any sample of chlorine atoms, 75.771% will be chlorine-35 and 24.229% will be chlorine 37. What is the average atomic mass of chlorine?

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Chlorine has two isotopes. Chlorine-35 has an actual mass of 34.9689 u and chlorine-37 has a mass of 36.9659 u. In any sample of chlorine atoms, 75.771% will be chlorine-35 and 24.229% will be chlorine 37. What is the average atomic mass of chlorine?

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Answer 1 · 2018-03-23T07:00:16

Take the weighted average of the isotopic masses....

Explanation:

And so....

$Atomic mass of Cl = (34.9689 \times 75.771 % + 36.9659 \times 24.229 %) \cdot amu$ $"Atomic mass of Cl"=(34.9689xx75.771%+36.9659xx24.229%)*"amu"$

$\equiv 35.4528 \cdot amu$ $-=35.4528*"amu"$

And $35.45 \cdot g \cdot m o l^{- 1}$ $35.45*g*mol^-1$ is the mass we generally take for chlorine...as the weighted average of $^{35} C l$ $""^35Cl$ and $^{37} C l$ $""^37Cl$ isotopes. Because the less massive isotope is MORE abundant, the average atomic mass is closer to the mass of this of this isotope....

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Chlorine has two isotopes. Chlorine-35 has an actual mass of 34.9689 u and chlorine-37 has a mass of 36.9659 u. In any sample of chlorine atoms, 75.771% will be chlorine-35 and 24.229% will be chlorine 37. What is the average atomic mass of chlorine?

1 Answer

Explanation:

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