Question

If lead has an average atomic mass of 207.2 and it has 3 isotopes with masses of 205.97, 206.98, 207.98, the last of which has a percent abundance of 69.4%, how would you set up the problem?

Answer 1

The average atomic mass of lead is 207.17 amu.

Step-by-step explanation:

To find the average atomic mass of lead, we will use the formula:

Average atomic mass = (mass1 x percent abundance1) + (mass2 x percent abundance2) + (mass3 x percent abundance3)

Plugging in the given values:

(205.97 x 0.006) + (206.98 x 0.314) + (207.98 x 0.694) = 207.17 amu

The average atomic mass of lead is 207.17 amu.