The mass of a single atom of an element X is 2.65*(10)-23g.What is its atomic mass?What could this element be?

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Solution

Concept : mole concept
1 mole of an atom = atomic mass of an element
1 mole of an atom = 6.023 x 10²³ atoms

Thus atomic mass of an element = 6.023 x 10²³ atoms
1 atom of an element X = 2.65 x 10^-23 g
6.023 atoms of elements X = 2.65 x 10^-23x 6.023 x 10²³ = 15.69 g = 16 g

Since the atomic mass of an element X is 16 g. The element must 'OXYGEN'

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