00:02
Using the given mass spectrum of lead, let's first draw up a table with the mass and atomic mass units versus the percent intensity that we can estimate from the mass spectrum.
00:25
So we have, first we have lead 204 and approximately 3 percent intensity.
00:32
And then we have lead 206, approximately 48 % intensity, and we have the isotope lead 207, approximately 40 % intensity, and we have lead 208, approximately 100 % intensity on our mass spectrum.
01:05
Using this data, let's calculate the percent abundance of each isotope.
01:13
So the percent abundance is 204 here.
01:26
Percent abundance of lead 204 is equal to 3 percent over.
01:34
Now this is going to give us a total here of.
01:40
We have 100 and 40 and 40.
01:50
38 and 3.
01:52
So this is 191 here, so 191 % times 100%...