It is zero. The number 02 is a number. It is a concept and no physical existence and no mass. So the mass percentage is zero.
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Percentage by Mass = Mass of substance of interest/Total Mass Percentage by Volume = Volume of substance of interest/Total Volume Converting from one to the other requires information about their relative densities.
The percentages refer to the amount of a substance of interest that is contained in a compound or mixture of that and other substances. Percentage by mass = 100*mass of substance of interest/total mass. Percentage by volume = 100*volume of substance of interest/volume mass. And, incidentally, the word is definition, not diffinition.
You cannot. The two are different things!
None. A gram is a measure of mass. A percentage is a way of representing a value: it is a concept and has no physical existence and therefore no mass.
density