The combustion of propane (C3H8)produces CO2 and H20: C3H8(g)+5O2(g) 3CO2(g)+4H2O(g) Calculate the mass, in grams, of H2O that will be produced if 2.5 mol of O2 is consumed.
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You do mol×molar mass which is 2.5×18 and the answer is 45g. Hope this answered your question correctly:)
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