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Category > Chemistry Posted 27 Apr 2017 My Price 4.00

combustion analysis

When finding the empirical formula from a combustion reaction (combustion analysis), why don't you need the number of grams of O2 initially present. I understand how you can calculate the number of moles of C and H, because both of those are only contained in the original hydrocarbon. Therefore, you can directly determine their mass percentages and molar amounts. However, oxygen is contained within the hydrocarbon (CxHyOz) and in the O2. Don't you need to know the initial amounts of O2 to determine how much mass of O2 you actually have? It doesn't seem to make sense how you can solve the problem without taking into account the O2.

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SuperTutor
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Status NEW Posted 27 Apr 2017 01:04 AM My Price 4.00

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