Given that the period of radon is 3.82 day and that the volume at normal temperature and pressure, of radon in equilibrium with 1 g of radium is 0.63 mm 3 , deduce the half value period of radium. Gram-molecular volume = 22.4 liter, atomic weight of radium = 226.
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Sol. Given:
Half life of radon
Volume of radon in equilibrium with 1 g radium
Molar volume 
Number of moles of radon:
Number of radon atoms:
For equilibrium:
Now,
Hence,
Atoms in 1 g radium:
Therefore,
Convert into years:
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