Chlorine, which has an atomic mass of 35.453 amu, has two naturally occuring isotopes, Cl-35 andcCl-37.?

Question

Chlorine, which has an atomic mass of 35.453 amu, has two naturally occuring isotopes, Cl-35 andcCl-37. Which isotopes occurs in greater abundance? Explain.

Answer 1

This is an isotopic abundance question, and really goes back to some basic algebra.

Cl 35 has an atomic weight of 34.96885271 daltons
Cl 37 has an atomic weight of 36.96590260 daltons

so you need to find the weighted-average equation:

assume the percent abundance of Cl35 is x, and that all of the atoms of chlorine are either Cl 35 or Cl37 (ignore any other isotopes for the purposes of the equation), thus

(x)(34.96885271) + (1-x)(36.96590260) = 35.453

34.96885271x - 36.96590260x + 36.96590260 = 35.453

-1.9970499x = -1.51290260

x = 0.75756875, or 75.76% Cl35, and the rest Cl37 (24.24%)

If Chlorine was exactly a 50-50 mixture of the two isotopes, the atomic mass listed in the periodic table would be exactly halfway between them (35.96737766). But, since the listed value is lower than that, the isotope with the greater abundance MUST be the lighter isotope, Cl35.

Answer 2

Atomic Mass Cl

Answer 3

Cl Atomic Mass

Answer 4

The AMU is calculated by adding the atomic masses of all isotopes, and their relative proportions.

Cl-35 weighs 35 AMU and Cl-37 weighs 37 AMU. Because the given AMU is closer to 25 than it is to 37, you know Cl-35 is much more common.

Answer 5

well the amu is the mass of the isotopes multiplied by their abundance, since the average atomic mass is closer to 35 than 37, Cl-35 is greater in abundance.

Answer 6

Cl-35 occurs in greater abundance. If the two occurred in equal abundance, the atomic mass would be 36.0. Instead, it's closer to 35, so that isotope must be more abundent.

Answer 7

CL-35. Because it's atomic mass is 35.5 it means that it's 75% CL-35 and 25% CL-37.

Answer 8

Atomic mass as quoted is an AVERAGE of 35.453. It follows therefore that Cl35 is more abundant than Cl37 - the average atomic mass being nearer the lower figure. Given these facts you can work out the precise ratio but I can't be arsed!

Answer 9

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I think it is 3. cl-35 with cl-35 cl-37 with cl-35 and cl-37 with cl-37

Answer 10

i guess that depends on if you have isolated isotpes or non isolated isotopes and if they are non isolated isotopes then you should isoslate them. Asking a question like that here on a web site dominaed by pree teens wondeing if someone they know in school might like them, what they should wear from prom and perverts competing to see who's the most disgusting is not the most briliant idea you ever had my friend.