Calculating Average Atomic Mass

Front

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?

Back

Multiply the mass of each isotope by its relative abundance (as a decimal), then sum these values.

Front

What is the formula for calculating average atomic mass?

Back

Average Atomic Mass = (mass1 * abundance1) + (mass2 * abundance2) + ...

Front

If an isotope has a mass of 39.946 amu and is 4.35% abundant, what is its contribution to average atomic mass?

Back

0.039946 * 0.0435 = 0.001735 amu.

Front

What is the significance of isotopes in calculating average atomic mass?

Back

Isotopes have different masses and abundances, affecting the overall average atomic mass of an element.

Front

What is the average atomic mass of an element with two isotopes: 10.013 amu (19.9% abundance) and 11.01 amu (80.1% abundance)?

Back

10.812 amu.

Front

What is the average atomic mass of silver?

Back

107.8677 amu.

Front

How do you determine the number of protons in an element from its average atomic mass?

Back

The number of protons is equal to the atomic number, which can often be inferred from the average atomic mass.

Front

What is the average atomic mass of silicon?

Back

28.09 amu.

Front

If an element has an average atomic mass of 33, what could be its identity?

Back

It could be Arsenic (As) with an atomic number of 33.