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The nuclidic ratio.(1)H^(3) to .(1)H^(1)...

The nuclidic ratio`._(1)H^(3)` to `._(1)H^(1)` in a sample of water is `8.0xx10^(-8):1`. Tritium undergoes decay with a half`-` life period of 12.3 years. How many tritium atoms would `10.0g` of such a sample contain 40 years after the original sample is collected.

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The correct Answer is:
`5.624xx10^(5)` atoms
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