Determine the number of grams of o2 gas was needed, Chemistry

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Determine the number of grams of o2 gas was needed

Suppose you have 124 g of a mystery substance. It is made up of Hydrogen, oxygen and Carbon. It is burned in excess the oxygen. It produces 28.925 g of H₂O and 161.527 g of CO₂. The molar mass is 270 g/mol. Determine the molecular and the empirical formula? For combustion carried out in this experiment, determine the number of grams of O₂ gas was needed to support the combustion of each gram of the mystery substance?

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