Question

There are four naturally occurring lead isotopes: lead-204 (1.4%), lead-205 (24.1%), lead-206 (22.1%) and

lead-208 (52.4)%. Using this information, calculate the average atomic mass of lead.

Answer 1

To calculate the average atomic mass of lead, multiply the abundance of each isotope by its atomic mass and sum up the results. The average atomic mass of lead is 207.2 g/mol.

Step-by-step explanation:

To calculate the average atomic mass of lead, we need to multiply the abundance of each isotope by its atomic mass and then sum up the results. The calculation is as follows:

1. Multiply the abundance of lead-204 (1.4%) by its atomic mass (203.973 g/mol).
2. Multiply the abundance of lead-205 (24.1%) by its atomic mass (205.974 g/mol).
3. Multiply the abundance of lead-206 (22.1%) by its atomic mass (206.976 g/mol).
4. Multiply the abundance of lead-208 (52.4%) by its atomic mass (207.977 g/mol).
5. Add up the results of the above calculations.

The sum of these calculations gives us the mass of 1 mole of lead isotopes, which is 207.22 g. Therefore, the average atomic mass of lead is 207.2 g/mol.