A rock occupies a volume of 20 cm and has a mass of 54 g. Find the density of
this rock.

Different isotopes indicate that an element will have different numbers of

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In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?