Po218 is an alpha emitter with a half-life of 3.0 minutes. If a sample contains

Question

Po218 is an alpha emitter with a half-life of 3.0 minutes. If a sample contains 44 mg of Po218 , how many alpha emissions would occur in 9.0 minutes? Express your answer using two significant figures.

**I got 5.5 but its wrong! It says that this question is not about what is left after 9 min, but how much is gone . I was asked to take the difference between the two numbers and i need to convert the milligram into grams then moles and then number of moles*** I'm confused! Can someone show me how to do it. Thanks!

Explanation / Answer

Po218 is an alpha emitter with a half-life of 3.0 minutes. If a sample contains

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