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N = N0 X e ^ (-kb X t)

where:

NO the initial amount = 100

kb is the constant = 0.056

t is the time = 50

I get 6.1 after 50 years.

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Q: The first-order rate constant for the decay of the radioactive isotope tritium is 0.056 year-1 What fraction of the tritium initially in a sample is still present 50 years later?
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