Regarding the equation C₂H₄ + O₂ ⇒ 2 H₂O + 2 CO₂, it is true that only the oxygen needs to be balanced. There are equal numbers of hydrogen and carbon.
According to the law of conservation of mass, matter is not created nor destroyed over the course of a chemical reaction. Thus, equations need to be balanced so the same number of atoms are on both sides.
How does the law of conservation of mass apply to this reaction:
C₂H₄ + O₂ ⇒ 2 H₂O + 2 CO₂?
- The equation needs to be balanced. There are fewer oxygen atoms in the equation than hydrogen or carbon. NO. We just compare oxygen atoms in the products with oxygen atoms in the reactants.
- Only the oxygen needs to be balanced. There are equal numbers of hydrogen and carbon. YES. Carbon and hydrogen atoms are already balanced.
- The law of conservation of mass has already been applied. There is an equal number of each element on both sides of the equation. NO. There is not the same number of oxygen atoms on both sides.
- Each element needs to be balanced. NO. In this equation, carbon and oxygen have already been balanced.
Regarding the equation C₂H₄ + O₂ ⇒ 2 H₂O + 2 CO₂, it is true that only the oxygen needs to be balanced. There are equal numbers of hydrogen and carbon.
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