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    Answer 6 questions correctly in a row.

Acetaldehyde is a substance commonly used in chemical factories. It is often produced by combining ethylene gas and oxygen gas.
Consider the following reaction:
2 molecules of ethylene
(
C
2
H
4
)
react with 1 molecule of oxygen
(
O
2
)
to produce some amount of acetaldehyde
(
C
2
H
4
O
).
To find the amount of acetaldehyde 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
H8
C4
O2
ref_doc_title.

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