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OpenStudy (vera_ewing):
A sample of unstable radon-222 has an initial mass of 0.200 g. After 7.6 days, 0.050 g of radon-222 remains. What is the half-life of radon-222? A. 7.6 days B. 3.8 days C. 1.9 days D. 15.2 days
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OpenStudy (vera_ewing):
@KyleWise16 help please!
OpenStudy (vera_ewing):
@JoannaBlackwelder Help please!
OpenStudy (vera_ewing):
@JFraser Help please!
OpenStudy (anonymous):
7.6 is the second half-life of the isotope so divide 7.6 by 2 to get the first half-life
OpenStudy (vera_ewing):
3.8 is the answer?
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OpenStudy (anonymous):
Yep
OpenStudy (vera_ewing):
Thank you!
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