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Working with the Half Life Equation

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Can you please explain how we are using the half life equation in this question? to get mass in grams after 13 days. The question is as follows:

Gallium-67 (t 1/2 = 78.25 hours) is used to diagnose certain tumors. If you ingest 0.055 mg of 67 GA what mass will remain in 13 days.

I started out using the integrated rate law to get K must have K to do half-life equation correct? and then to the 1/2 life equation. Do hours always have to be converted to seconds?

Thank-you.

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Solution Summary

The solution provides and easy to follow explanation of the concepts and gives all mathematical steps wherever necessary.

Solution Preview

We have the half-life equation as,

t_1/2 = 0.693/lambda where lambda is the disintegration constant

==> lambda = ...

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