Question

When a balloon filled with 1.249 g of hydrogen explodes, the hydrogen reacts with 9.99 g of oxygen to form water vapor. Assuming water vapor is the only product formed, how much water vapor is produced?
2H2 + O2 ==> 2H2O
1.249 g + 9.99 g = ?
The law of conservation of mass says that you get out what you put in.

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