How to Calculate Percent Abundance?

Answer

If you're referring to atomic percent in chemistry, you need to divide the number of atoms in the molecule or compound molecule by the atoms of each substance and multiply by 100. If you're calculating abundance by mass (the more likely scenario) by atomic weights. You can find atomic weights on any periodic table.
Q&A Related to "How to Calculate Percent Abundance?"
1. Determine the element's average atomic mass number using the periodic table of the elements. This will be a number with several decimal places behind it. This value is the average
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How do you calculate percent abundance of an isotope? You find the isotope number and then you calculate that into a fraction and then turn the fraction into a percentage and divide
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Pretend that you have a 100. g sample of rubidium. 27.8 g would be Rb-87 27.8 g/(87 g/mol) = 0.31954023 mol 72.2 g would be Rb-85 72.2 g/(85 g/mol) = 0.849411765 mol Total mass is
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Subtract the larger number from the smaller and divide and multiply. Here is a formula. Divide A/B=C C x 100=D%D%100%E the percentage.
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How to Calculate Percent Abundances
An isotope of an element is a variant in the nuclear makeup of the atom. Isotopes have different numbers of neutrons from atom to atom of the same element. The number of protons in the nucleus does not change from atom to atom. The mass number for every... More »
Difficulty: Moderate
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