Average Atomic Mass

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What is Average Atomic Mass?

Back

The weighted average of the masses of an element's isotopes, taking into account their relative abundances.

Front

How do you calculate Average Atomic Mass?

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Average Atomic Mass = (fraction of isotope 1 * mass of isotope 1) + (fraction of isotope 2 * mass of isotope 2) + ...

Front

What is an isotope?

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Atoms of the same element that have the same number of protons but different numbers of neutrons, resulting in different masses.

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What is the significance of atomic mass units (amu)?

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Atomic mass units are a standard unit of mass that quantifies mass on an atomic or molecular scale.

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If 50% of an element has a mass of 10 amu and 50% has a mass of 20 amu, what is the average atomic mass?

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Average Atomic Mass = (0.5 * 10) + (0.5 * 20) = 15 amu.

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What does it mean if two atoms are isotopes of each other?

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They have the same number of protons but different numbers of neutrons.

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What is the average atomic mass of an element with isotopes of 75.23 amu (24.1%), 74.61 amu (48.7%), and 75.20 amu (27.2%)?

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74.92 amu.

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What is the average atomic mass of atom X with isotopes of 39.946 amu (4.35%), 41.941 amu (83.79%), 42.941 amu (9.50%), and 43.939 amu (2.36%)?

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41.97 amu.

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What is the formula to find the average atomic mass of an element with two isotopes?

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Average Atomic Mass = (fraction of isotope 1 * mass of isotope 1) + (fraction of isotope 2 * mass of isotope 2).

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What is the atomic mass of Nitrogen-15?

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15 amu.