How does the law of conservation of mass apply to this reaction: c2h4+> 2h2o+2co2 a. only the oxygen needs to be balanced b. the equation needs to be balanced. there are fewer oxygen atoms in the equation than hydrogen and carbon c. the law of conservation of mass has already been applied d. each element needs to be balanced

The answer is; C

There are 2 Carbons, 4 Hydrogens, and 6 oxygens  on both sides

All the moles of the elements on the right of the reaction equation are balanced with those on the left of the equation. These moles are indicated by the number in front  of the symbols of the elements. This ensures that the first law of thermodynamics is observed. This law states that no matter or energy can be destroyed or created; It can only be transformed.  

the answer to your question is c

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