Question

how to find the mass of single atom or molecule of Carbon

Answer 1

to find the atomic no. of any atom. Double its atomic no. then you'll find the atomic weight

Same like that in molecule, atomic weight × no. of atoms in the molecule.
You'll find the weight of that object.

Carbon atomic no. is 6
so 6 doubles = 12
12 is the atomic weight of carbon
where in a molecule
12×no. of atoms in the carbon molecule given

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