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Chemistry
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25 Jun 2020

Calculate the average atomic mass of hydrogen using the following data:

Isotope % Natural abundance Atomic mass
1H 99.985 1.0
2H 0.015 2.0

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AP Chemistry
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Solve problems involving atoms
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Related questions

Write the molecular formula for a compound with the possible elements C, H, N, and O that exhibits a molecular ion at M+ = 98.111

Exact Masses of the Most Abundant Isotope of Selected Elements
Isotope Natural abundance (%) Exact mass
1H 99.985 1.008
12C 98.90 12.000
14N 99.63 14.003
16O 99.76 15.995

Rubidium has two stable isotopes, 85Rb and 87Rb. The 87Rb isotope has a natural abundance of 27.83% and an atomic mass of 86.909183 amu. Calculate the percent abundance and atomic mass of the 85Rb isotope.

The element lanthanum has an atomic weight of 139 and consists of two stable isotopes lanthanum-138 and lanthanum-139.

The isotope lanthanum-138 has an atomic mass of 138 amu and a percent natural abundance of 8.90E-2 %.
The isotope lanthanum-139 has a percent natural abundance of 99.9 %.

What is the atomic mass of lanthanum-139?

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