(Answered) Part aphosphorus-32 has a half-life of 140 days starting

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Part A)

Phosphorus-32 has a half-life of 14.0 days. Starting with 8.00 g of 32P, how many grams will remain after 42.0 days?

Part B)

Carbon-14 has a half-life of 5730 years. In a plant fossil, you find that the 14C has decayed to 1/32.0 of the original amount. How long ago was this plant alive?

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