The molecular formula of caffeine is C₈H₁₀N₄O₂. What is the empirical formula? Listelements in this order: C, H, N, O

A sample of an iron and oxygen containing compound has a total mass of 8.654 g. It is found 6.058 g of the sample is pure iron. What is the empirical formula ofthis compound? List elements in this order Fe, O

Evaluate the chemical formulas of the following minerals:
FeCO₃: glitterite
Fe₃O₄: limeatite
Fe₂O₃: pyrotechnite
Which mineral has the greatest % Fe content? What is the %Fe expressed with 3 significant figs? Simply list the chemical formula, put one space, then the numerical percentage.Do not use a percentage symbol.

A 100.00 g sample of potatoite (a beautiful, purple mineral) was analyzed and found to contain: 3.73 g lithium, 14.50 g aluminum, 30.18 g silicon and the remaining mass is oxygen. Determine the empirical formula for potatoite. List elements in this order: Li, Al, Si, O

Lab analysis reveals that a 100.00 g sample of an unknown hydrocarbon contains 63.15 g of carbon, 31.55 g of oxygen and the remainder is hydrogen. Additional tests prove the molar mass of this unknown hydrocarbon is ~305 g/mol. Determine the molecular formula of this unknown hydrocarbon. List elements in this order: C, H, O

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