Chemistry

Chemistry, 15.10.2019 17:00, jocelynbeoletto

Radium decays to form radon. which equation correctly describes this decay?

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Chemistry, 05.07.2019 20:10, hipstersale4913

Radon gas as rn-222 is formed by the radioactive decay of u-238, the chief natural isotope of uranium, found in soils and especially granitic rocks. as rn-222, radon decays through several daughter-product isotopes to stable pb-2016. the gas occurs in air at natural levels of 0.1 to 0.2 pci/l, and is considered a health hazard (cancer risk) by the u.s. environmental protection agency at or above 4 pci/l in air. rn-222 decays by the emission of alpha particles (helium nuclei) with a half-life or decay half-time of 3.823 days. (a) what is its decay rate constant in s-1? (b) the mole fraction solubility of pure radon gas in water (nrn) from 3 to 970c at 1 atm radon gas pressure, is given by the equation r in nrn = -499.309 + (25864.2/t) + 69.3241 in t + 0.00101227 t where r = 1.9872 cal/mol k, and t is in degrees k. calculate the henry's law constant for rn gas at 250 c in m/bar? (c) well waters pumped from granitic rocks or uraniferous sandstones may be high in radon. exsolution of the gas into the air in a shower stall may result in air levels in excess of 4pci/l. what m concentration of dissolved rn in a groundwater would be in equilibrium with 4 pci/l of radon gas in bathroom air at 250c.

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Physics, 23.08.2019 11:30, niyah2x3

When radium-226 decays to form radon-222, what type of decay occurred? a. alpha b. beta c. gamma d. electron

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Mathematics, 07.10.2019 11:50, Kzamor

Radium decays according to the function where q represents the quantity remaining after t years and k is the decay constant 0.00043. how long will take for 40g of radium to decay to 10g?

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