Answer:
2
Explanation:
The coefficient for O is 2 and this is an example of a combustion reaction. With the help of the coefficient 2 infront of oxygen, this equation now demonstrates law of conservation of mass.
The coefficient for O₂ that demonstrates the law of conservation of mass is
2.
The law of conservation of mass states that mass can neither be created
nor destroyed but can be transformed from one form to another.
The mass of the reactant and the mass of the product should be equal.
Therefore, let's balance the equation
CH4 (g) + 0₂(g) → CO₂(g) + 2H₂O(g)
For the equation to be balanced the masses of each molecules on both
sides will be the same .
Therefore,
CH4 (g) + 20₂(g) → CO₂(g) + 2H₂O(g)
The coefficient of 2 for O₂ will balance the masses of oxygen on both
sides of the chemical equation.
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