If two substances have different densities then their mixture will contain different proportions depending on whether you look at their mass or volume.
For example, consider two substances, A and B where the densities of A and B are 1 gram per cc and 2 grams per cc, respectively. Suppose the mixture comprise 10 grams of A (= 10 cc) and 10 grams of B (= 5 cc). Then the total mass of A+B is 20 grams so that A accounts for 50% (10 out of 20) by mass. The total volume is 15 cc so A accounts for 67% (10/15) of the mixture.
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20 percent is a number while an ounce is a measure of mass. There is no direct relation between the two.
Take percent abundance times atomic mass for each isotope then add all up for average atomic mass.
A percent is a pure number so 5 grams can only be expressed as a percent of some measure of mass.
LL
None.A ton is a measure of mass. Mass is the amount of substance contained in some volume of a body. A square foot is a measure of area. It is a 2-dmensional measure and comprises no volume at all. Therefore, there cannot be any mass associated with an area.