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Misha Larkins [42]
3 years ago
15

A hypothetical element has three main isotopes with mass numbers of 51, 53, and 54. If 15.00% of the isotopes have a mass number

of 51 amu and 30.00% of the isotopes have a mass of 53 amu, what atomic weight should be listed on the periodic table for this element?

Chemistry
1 answer:
Eva8 [605]3 years ago
5 0

Answer: 53.25

Explanation: Please see attachment for explanation. Thanks.!

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Answer:

2.765amu is the contribution of the X-19 isotope to the weighted average

Explanation:

The average molar mass is defined as the sum of the molar mass of each isotope times its abundance. For the unknown element X that has 2 isotopes the weighted average is defined as:

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The contribution of the X-19 isotope is its mass (19.00 amu) times its abundance (14.55% = 0.1455). That is:

19.00amu * 0.1455 =

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