Chemistry
Which of the following reactions is not correct according to the laws?
P4 + 5O2 ⟶ P4O10
C2H6 ⟶ CO2 + H2O
2Zn + O2 ⟶ 2ZnO
CH4 + 2O2 ⟶ CO2 + 2H2O
Chemical Equation
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Answer
C2H6 ⟶ CO2 + H2O
Reason — C2H6 ⟶ CO2 + H2O
This equation does not follow the Law of conservation of mass because reactant side has 2 carbon atoms and 6 hydrogen atoms whereas product side has only 1 carbon atom and 2 hydrogen atoms. Since both the sides do not have the same number of atoms, it violates the Law of conservation of mass which states that matter can neither be created nor destroyed in a chemical reaction.
Other reactions are balanced. The total number of atoms of each element on the reactants side, is the same as the number of atoms in the products formed, in the equation. So, they follow the Law of conservation of mass.
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