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Sergio039 [100]
3 years ago
12

Rhenium (Re) is made up of 37.4% 185Re and 62.6% 187Re. The atomic mass of 185Re is 184.953 amu. The atomic mass of 187Re is 186

.958 amu. What is the average atomic mass of rhenium?
Chemistry
2 answers:
Anna007 [38]3 years ago
8 0
To calculate the average mass of the element, we take the summation of the product of the isotope and the percent abundance. We calculate as follows:

Average atomic mass = .374 ( 184.953 amu ) + .626 ( <span>186.958 amu )  = 186.208 amu

Hope this answers the question. Have a nice day.</span>
Lelu [443]3 years ago
7 0

Answer:

186.207

Explanation:

done the topic

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Number of moles of CaI2 = 0.400

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