204.) Radon-222 gas can be found seeping from granite that contains uranium-238. Radon-222 is a nuclide in the radioactive decay series of uranium-238. Radon is an element with a half-life of 3.82 days. The U.S. Environmental Protection Agency recommends that the concentration of radon gas in dwellings not exceed 4.0 piCi per liter of air. What mass of Rn-222  would be in a 7.0 L sample of air that had a decay rate of 4.0 piCi? Mass =

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A: Here we are asked to write the nuclear equation for the alpha decay ofRn-222

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Writing and Balancing Nuclear Equations

A nuclear equation is a symbolic representation of a nuclear reaction using certain symbols. It is studied in nuclear chemistry and nuclear physics.