Radium-224 is radioactive and decays by emitting an α-particle. (a) Write an equation for this process, (b) The decay of radium-224 produces helium gas. Rutherford and Geiger determined that α-particles were emitted from at a rate of 7.65 × 1012 s–1 mol–1, and that this corresponded to a rate of helium production of 2.90 × 10–10 dm3 s–1 at 273 K, 1 bar. If 1 mole of helium occupies 22.7 dm3 (273 K, 1 bar), estimate a value for the Avogadro constant.
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