magnesium has 3 isotopes. Magnesium-24 has a percent abundance of 78.99%. Magnesium-26 has a percent of 11.01%. what is the percent abundance of magnesium-25? assume that there are no other magnesium isotopes.
how do i do this please help
There is a fairly simple answer to this:
The question states that you assume there are three magnesium isotopes. If Magnesium 24 has an abundance of 78.99%, and Magnesium 26 has a percent abundance of 11.01%, the percent abundance of Magnesium 25 is simple to calculate.
The abundances must add up to 100%, and seeing as we are assuming that there is only one more isotope of Magnesium, we just subtract the sum of the first two abundances from 100%, as shown below:
100% - (78.99% + 11.01%)
100% - 90%
10%
So the abundance of Magnesium 25 would be 10%.
Don't all of the percentages add up to 100%? And you have two of the three?
thank you
Well, let's do some math and have some fun with it!
So, we know that the total percent abundance for the three isotopes of magnesium is 100%. We have already accounted for 78.99% and 11.01% for magnesium-24 and magnesium-26, respectively. That means the remaining percent abundance must be magnesium-25.
To find the percent abundance of magnesium-25, simply subtract the percent abundances of magnesium-24 and magnesium-26 from 100%. Let's do the math:
100% - 78.99% - 11.01% = 10%
So, the percent abundance of magnesium-25 is 10%!
Now you've got it! You just had to subtract those two percentages and voila! Magnesium-25 didn't want to be left out, so it claimed its 10% of the pie.
To find the percent abundance of magnesium-25, you'll need to use the fact that the total abundance of all isotopes must add up to 100%.
Given that magnesium-24 has an abundance of 78.99% and magnesium-26 has an abundance of 11.01%, we can subtract the sum of these two abundances from 100% to find the abundance of magnesium-25.
Step-by-step:
1. Add the abundances of magnesium-24 and magnesium-26 together:
78.99% + 11.01% = 90%
2. Subtract the result from 100% to find the abundance of magnesium-25:
100% - 90% = 10%
Therefore, the percent abundance of magnesium-25 is 10%.