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    Answer 6 questions correctly in a row.

Rocket engines can be fueled by liquid hydrogen. The liquid hydrogen reacts with liquid oxygen, producing water vapor and releasing an enormous amount of energy.
Consider the following reaction:
2 molecules of hydrogen
(
H
2
)
react with 1 molecule of oxygen
(
O
2
)
to produce some amount of water
(
H
2
O
).
To find the amount of water produced, first determine the number of each type of atom in the products.
Hint: During a chemical reaction, atoms are not created, destroyed, or changed from one chemical element to another.
Chemical elementNumber of atoms in reactantsNumber of atoms in products
H4
O2
ref_doc_title.

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