To measure the volume of the blood in an animal’s circulatory system, the following experiment was performed. A 5.0-mL sample of an aqueous solution containing 1.7 × 105 counts per minute (cpm) of tritium was injected into the bloodstream. After an adequate period of time to allow for the complete circulation of the tritium, a 5.0-mL sample of blood was withdrawn and found to have 1.3 × 103 cpm on the scintillation counter. Assuming that only a negligible amount of tritium has decayed during the experiment, what is the volume of the animal’s circulatory system?
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