Problem:  A hydrogen-filled balloon was ignited and 1.50 g of hydrogen reacted with 12.0 g of oxygen. How many grams of water vapor were formed? (Assume that water vapor is the only product.) 

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 A hydrogen-filled balloon was ignited and 1.50 g of hydrogen reacted with 12.0 g of oxygen. How many grams of water vapor were formed? (Assume that water vapor is the only product.)