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C. 2H₂ + O₂ ⇒ 2H₂O

Further explanation

Conservation of mass states that in a closed system, the masses before and after the reaction are the same. So it can be concluded

mass of the reactants = mass of the products

mass cannot be created or destroyed

The number of atoms involved in a reaction remains the same⇒ number of moles also the same

chemical equation in balanced form

So let's see which of the several options , which one has the same number of atoms on both sides of the equation

2H₂ + O₂ ⇒ 2H₂O

H ⇒ left 4, right 4

O ⇒ left 2, right 2

so the equation is in balance and represents the Law of Conservation of Mass

Explanation:

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the temperature of the gas, in k, not celsius.