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September 4, 2015

Homework Help: AP Chem

Posted by Anna on Wednesday, November 12, 2008 at 9:20pm.

Help with these two please.

105. A radioactive metal atom decays (goes to another kind of atom) by emitting an alpha particle (He+2 ion). The alpha particles are collected as helium gas. A sample of helium with a volume of 12.05 mL was obtained at 765 mmHg and 23 Degrees C. How many atoms decayed during the period of the experiment?



108. A hydrocarbon gas has a density of 1.22 g/L at 20 degrees C and 1.00 atm. An analysis gives 80.0% C and 20.0% H. What is the molecular formula?

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