The nuclide ratio, `._(1)^(3) H` to `._(1)^(1) H` in a sample of water is `8.0xx10^(-18) : 1` Tritium undergoes decay with a half-life period of `12.3yr` How much tritium atoms would `10.0g` of such a sample contains `40` year after the original sample is collected?

Explanation

Given that , `("mol of " T_2O "molecules")/("mol of " H_2O" molecules") = (8 xx 10^(-18))/(1)`
` therefore 10g` of sample contains `(2 xx 8 xx 10^(-18)) xx 10/18` mole tritium atoms`
`5.62 xx 10^5`