Review: Average Atomic Mass

Front

What is average atomic mass?

Back

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

Front

What does the symbol 'amu' stand for?

Back

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

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 significance of isotopes in calculating average atomic mass?

Back

Isotopes have different masses, and their relative abundances affect the average atomic mass of an element.

Front

If an isotope has a mass of 10 amu and makes up 50% of the sample, what is its contribution to the average atomic mass?

Back

5 amu (10 amu * 0.50).

Front

What is the average atomic mass of an element with isotopes of 12 amu (90%) and 14 amu (10%)?

Back

12.2 amu (12 amu * 0.90 + 14 amu * 0.10).

Front

What does a higher percentage of an isotope indicate about its contribution to average atomic mass?

Back

It indicates a greater influence on the average atomic mass due to its higher abundance.

Front

What is the average atomic mass of an element with isotopes of 20 amu (25%) and 22 amu (75%)?

Back

21.5 amu (20 amu * 0.25 + 22 amu * 0.75).

Front

What is the average atomic mass of an element with isotopes of 35 amu (50%) and 37 amu (50%)?

Back

36 amu (35 amu * 0.50 + 37 amu * 0.50).

Front

What is the average atomic mass of an element with isotopes of 56 amu (6%) and 58 amu (94%)?

Back

57.88 amu (56 amu * 0.06 + 58 amu * 0.94).