Question

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Find the number of atoms in 12 grams of carbon.

Answer 1

For this it requires to find the number of moles of given substance.
Number of moles = given weight/ atomic weight
Given weight = 12 grams, atomic weight of carbon = 12
    Number of moles   = 12/12
 Number of moles      = 1

Mole: An amount of substance of a system which contains as many elementary Units as there are atoms of carbon in 0.012 kilogram of the pure nuclide carbon-12. The elementary unit must be specified and may be an atom, molecule. The value is 6.022*10²³ (Avogadro number).

Calculation of value of Avogadro number 
    = 12 grams of of C¹²/ Mass of C¹²
    = 12 grams of C¹²/ 1.992648 * 10⁻²³ grams
    = 6.0221367 * 10 ²³ atoms / mole
1  mole of any atom/molecule contains = Avogadro number (6.023*10²³)of atoms/ molecules.