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13 Dec 2019

If 200. mg of fluorine-18 is shipped at 8:00 A.M., how many milligrams of the radioisotope are still active when the sample arrives at the radiology laboratory at 1:30 P.M.? Express the mass to three significant figures and include the appropriate units.

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Tod Thiel
Tod ThielLv2
17 Dec 2019

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Related questions

Part A

A 110-mg sample of technetium-99 m is used for a diagnostic test. If technetium-99 m has a half-life of 6.0 h, how many milligrams of the technetium-99 m sample remains active 24 h after the test?

Express your answer to two significant figures and include the appropriate units.

1. In the gaseous state, chlorine exists as a diatomic molecule Cl2 (Molar mass = 70.9 g/mol ). Calculate the number of moles of chlorine present in 100 g of chlorine gas. Express the quantity in moles to three significant figures.

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5. How many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 30.6 moles of water vapor? Express your answer with the appropriate units. For example, write the unit moles as mol.

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