Question

the mass of an atom of one carbon atom is 12.011u .what is the mass of 20 atoms of same isotopes
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Answer 1

Answer:

On the periodic table the mass of carbon is reported as 12.01 amu. This is the average atomic mass of carbon. No single carbon atom has a mass of 12.01 amu, but in a handful of C atoms the average mass of the carbon atoms is 12.01 amu.

Answer 2

Mass of 1 carbon atom = 12.011u

Mass of 20 carbon atom = 240.22u

Hope this will help....