A mass of 18.76 g for an unknown fuel was combusted in a reaction vessel containing an unknown amount of

A mass of 18.76 g for an unknown fuel was combusted in a reaction vessel containing an unknown amount of oxygen. At the end of the reaction, there still remained 18.70 g of the fuel as well as 0.0981 g of water and 0.1797 g of carbon dioxide. The oxygen was completely consumed during the reaction. How many molecules of oxygen gas were initially present in the reaction vessel

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