As we know 1Ci = 3.7×10∧10 radiation which is per second. N is number of atoms and if they are radiated it will be N× decay constant = 1Ci ⇒ N= 1 cl/decay constant = 3.7×10∧10/decay constant Decay constant = ln(2)/ half life = ln(2) / 5730 years. = ln (2) / (5730×365×24×3600 seconds) = 3.8359×10∧(-12) Number of atoms = 3.5 × 10∧(-6)× 3.7 ×10∧ 10/ (3.8359×10∧(-12)) = 3.376 × 10∧ 16 ∴ The number of moles = number of atoms / (6.022× 10∧23) = 5.6061 × 10∧(-8) mass = Molar mass × number of moles = 5.6061 × 10∧(-8) × 14 grams =7.8486 × 10∧(-7) grams.
