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I'm doing test corrections for a test and i can't seem to get this last problem. Please help! A .519 gram of the compound burns in O2 to produce 1.24 grams of CO2 and .255 grams of H2O A- Calculate the individual masses of C, H and O in the .519 gram sample B- Determine the empirical formula...

How many Fe atoms and how many moles of Fe atoms are in 250.0 g of iron? and The empirical formula of styrene is CH; the molar mass of styrene is 104.14 g/mol. How many H atoms are present in a 1.10 g sample of styrene? I did most of the work for both problems but i can't seem to get the...