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When 13.0 grams of acetylene, C2H2, is reacted, what mass of water, H2O, is produced?

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Reacted with what? O2?
2C2H2 + 5O2 ==> 4CO2 + 2H2O
mols C2H2 = grams/molar mass = ?
Then H2O = mols C2H2 x (2 mols H2O/2 mols C2H2) = ? mols H2O
Convert mols H2O to grams.
grams H2O = mols H2O x molar mass H2O

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