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 an isotope?

Back

Atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

What does amu stand for?

Back

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

Front

If an element has isotopes with masses of 10 amu (50%) and 12 amu (50%), what is the average atomic mass?

Back

11 amu.

Front

What is the significance of the number of protons in an element?

Back

The number of protons determines the element's identity and its position on the periodic table.

Front

What is the formula for calculating the average atomic mass of an element with multiple isotopes?

Back

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

Front

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

Back

21.5 amu.

Front

What is the role of relative abundance in calculating average atomic mass?

Back

Relative abundance indicates how common each isotope is, affecting the average mass calculation.

Front

What is the average atomic mass of an element with isotopes of 30 amu (10%) and 32 amu (90%)?

Back

31.8 amu.