Rdium-226 atomic mass 226025402 decays to radon-224 a
Radium-226 (atomic mass = 226.025402 ) decays to radon-224 (a radioactive gas) with a half-life of 1600 years. what colume of radon gas is produced by 25.0 g of radium in 5.0 days?
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What is the hydronium-ion concentration of a 0.40 M solution of HCN (Ka= 4.9×10-10) at 25° C?
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