Chemistry problem i don't understand how to do?
A 0.20-mL sample of a solution containing H-3 that produces 3.7 x 10^3 cps is injected into the bloodstream of an animal. After allowing circulatory equilibrium to be established, a 0.20-mL sample of blood is found to have an activity of 20. Cps. Calculate the blood volume of the animal.
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I assume you are injecting tritium, and that its half-life is long compared to the time required to establish a uniform concentration [which is NOT equilibrium].
Then it is just a volume x counts/volume = counts = constant type of problem
So if the entire blood volume is giving off 3700 counts/sec, and .2 ml gives 20, then the volume of blood is .2 ml [3700/20] = 37 ml [small animal I guess]
(3700 / 20) * 0.20 mL = 37 mL.