The nuclidic ratio of 1 H 3 to 1 H 1 in a sample of water is 8.0 × 10 –18 : 1. Tritium undergoes decay with a half life period of 12.3 year. How many tritium atoms would 10.0 g of such a sample contains 40 year after the original sample is collected?
Text Solution
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Ratio of 
Tritium decays as below:
Half life period 
years
Disintegration constant 
Consider one mole of water
mol.wt.of 
1 mole of 
wt.of 
atom of hydrogen
18 g of 
contain hydrogen atoms
10 g of 
contain hydrogen atoms
Since, the ratio of tritium 
No. of tritium atoms of 10 g of 
Initial conc. of 
atoms in 10 g of 
Let the conc. left after 
= 5.624 × 10 5 atoms
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