For 1.9 mole of the radioactive isotope chromium-51, half-life = 27.8 days, how many disintegrations h

Question

For 1.9 mole of the radioactive isotope chromium-51, half-life = 27.8 days, how many disintegrations have occurred after 17 minutes?

Answer 1

That's a lot of chronium to be decaying away.
Your first step is to find how much of the isotope is still around after 17 minutes. Your equation is
M(17 minutes)/1.9 moles = exp (-k T in minutes) where k is the decay constant and equal to 0.693/T(half-life) but expressed in minutes.
Once you find how much is still around (which should be almost all), you can figure the amount that has decayed. Multiply that amount by 6.02x 10^23 to get your answer.

Answer 2

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Answer 3

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