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 percent abundance (as a decimal), then sum these values.

Front

What is an isotope?

Back

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

Front

What does percent abundance mean?

Back

The percentage of a particular isotope present in a sample of an element.

Front

If an element has two isotopes, how do you find the average atomic mass?

Back

(Mass of Isotope 1 * Percent Abundance 1) + (Mass of Isotope 2 * Percent Abundance 2) = Average Atomic Mass.

Front

What is the significance of the average atomic mass in chemistry?

Back

It helps predict how an element will behave in chemical reactions and is used in calculations involving moles.

Front

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%)?

Back

74.92 amu.

Front

What is the incorrect statement about isotopes?

Back

The percent abundance of all isotopes is equal. Different color beans cannot represent isotope.

Front

What is the average atomic mass of an element with isotopes of 20.74 amu, 22.56 amu, and 24.31 amu?

Back

24.31 amu.

Front

What is the average atomic mass of an element with isotopes of 106.38649 amu, 111.91896 amu, and 107.8677 amu?

Back

107.8677 amu.