Average Atomic Mass

Front

What is average atomic mass?

Back

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

Front

How do you calculate the average atomic mass of an element with multiple isotopes?

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To calculate the average atomic mass, multiply the mass of each isotope by its relative abundance (as a decimal), then sum these values.

Front

What is the average atomic mass of silicon?

Back

28.09 amu.

Front

What is the average atomic mass of silver?

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107.8677 amu.

Front

If an element has isotopes with masses of 75.23 amu (24.1%), 74.61 amu (48.7%), and 75.20 amu (27.2%), what is its average atomic mass?

Back

74.92 amu.

Front

What is the average atomic mass of magnesium with isotopes?

Back

24.31 amu.

Front

How do you express the relative abundance of an isotope as a decimal?

Back

To express relative abundance as a decimal, divide the percentage by 100.

Front

What is the average atomic mass of an element with isotopes having masses of 49.9461 amu (4.35%), 51.9405 amu (83.79%), 52.9407 amu (9.50%), and 53.9389 amu (2.36%)?

Back

51.99 amu.

Front

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

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The average atomic mass is important for understanding the mass of atoms in chemical reactions and for calculating molar masses.

Tags

NGSS.HS-PS1-7

Front

What is the formula for calculating average atomic mass?

Back

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