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Phosphorus-32 has a half-life of 14.0 days. Starting with 8.00 g of 32P, how many grams will remain after 112 days ?

A brain scan uses the radioisotope oxygen-15. The recommended dosage is 60 mCi . A supply of 220 mCi in 40 mL arrives at the lab. How many mL will be injected into a patient?
Express your answer to one significant figure and include the appropriate units.

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MissPhiladelphia
The answer to the question is as follows:

(2.00 g) x (1/2)^(42.0 / 14.0) = 0.25 g 

I hope my answer has come to your help. God bless and have a nice day ahead!

Answer:

Explanation:

Injection volume = 60mCi × 40mL/260mCi = 10.90 mL

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