Question

how many atoms are there in 12 u of carbon

Answer 1

12 u carbon is 1 mole. 1 mole always contains Avogadro number of atoms (6.022×10^23).

Answer 2

12u is the mass of one atom of carbon

so,

in 12u there will be only 1 atom of carbon

but if there is 12g of carbon

then there will be 6.022 × 10²³ atoms of carbon

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