A radioactive metal atom decays (goes to another kind of atom) by emitting an alpha particle (He

Question:

A radioactive metal atom decays (goes to another kind of atom) by emitting an alpha particle (He²⁺ ion). The alpha particles are collected as helium gas. A sample of helium with a volume of 9.050 mL was obtained at 765 mmHg and 23°C. How many atoms decayed during the period of the experiment?

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