Posted by Mat on Thursday, November 25, 2010 at 5:11pm.
C2H2+O2->CO2+H2O
First, notice that the chemical equation is not balanced. Add coefficients in front of the molecules of the reactants and/or products to get the number of atoms (C, H, O) for reactants = products.
Convert the 18g of CO2 by the molar mass (this can be computed by looking at the periodic table i.e. 12.01g + 2(16g)) to convert CO2 to moles. Using the mole ratio (i.e. the coefficients of CO2 and H2O), you can convert mol CO2 to mol H2O.
http://www.chemteam.info/Stoichiometry/Mole-Mass.html
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