

Number of atoms of 12C in 1 mole= 6.023 × 1023
Since 1 atom of 12C contains (16 – 6) i.e., 8 neutrons,
the number of neutrons in 12 g of 12C is (6.023 × 1023) ×8.
Or, 12 g of 14C contains (6.022 × 1023 × 8) neutrons.
Number of neutrons in 6 mg = (6.022 × 1023 × 8)/2 = 2.408 × 1021
