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The nuclide ratio, .(1)^(3) H to .(1)^(1...

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?

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The correct Answer is:
`5.6xx10^(5)`
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