Mathematics, 24.07.2019 12:00 levicorey846
The radioactive isotope carbon-11 is used in medicine for brain-scan procedures. it decays losing half its mass every 20 minutes. if a doctor checks on a patient two hours after the isotope has been administered and 0.10 microgram of it still remains, what is the amount of isotope carbon-11 administered to the patient.
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How many liters of peroxide should be added to 12 liters of an 8% peroxide solution so that the resulting solution contains 16% peroxide? original added new amount of peroxide 0.96 liters x 0.96 + x amount of solution 12 liters x 12 + x 0.18 liter 1.14 liters 1.92 liters 2.10 liters
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