CHEMISTRY - Calculations - Calculating Relative Atomic Mass

The video tutorial explains how to calculate the relative atomic mass of an element using its isotopic abundances. It uses carbon and chlorine as examples, detailing the steps to find the atomic mass by multiplying the mass number of isotopes by their abundance and summing the results. A challenge is presented to calculate the atomic mass of uranium, reinforcing the method. The tutorial concludes with a summary of the calculation process, emphasizing the importance of understanding isotopic abundances and mass numbers.

What is the relative atomic mass of carbon primarily based on?

• The number of protons in carbon-12

• The isotopic abundance of carbon-12

• The average mass of all carbon isotopes

• The number of neutrons in carbon-14

How many neutrons are present in the chlorine-35 isotope?

• 18

• 17

• 19

• 20

What is the first step in calculating the relative atomic mass of chlorine?

• Add the mass numbers of all isotopes

• Subtract the number of protons from the mass number

• Multiply the mass number of each isotope by its abundance

• Divide the total mass by the number of isotopes

What is the relative atomic mass of chlorine after calculation?

• 35.0

• 35.5

• 36.0

• 37.0

What is the final step in calculating the relative atomic mass of an element?

• Subtract the number of neutrons

• Multiply the total by 100

• Add the isotopic abundances

• Divide the total mass by 100