The correct answer is 4 i.e 2Mg + O2 → 2MgO

Explanation:

You are viewing: Which Of The Following Is A Balanced Chemical Equation

• According to the law of conservation of mass, when a chemical reaction occurs, the mass of the products should be equal to the mass of the reactants.
• A balanced chemical equation occurs when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side.

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Steps to Balance an Equation-.

• In general, to balance an equation, here are the things we need to do-
• Count the atoms of every element in the reactants and the products.
• Use coefficients; place them in front of the compounds as needed.
• The steps are simple, but it is a process of trial and error.
• Let’s take a look at a few more example equations and techniques that can be used to balance each one.
• An equation representing a chemical reaction– Example In this chemical reaction, nitrogen (N2) reacts with hydrogen (H) to produce ammonia (NH3).
• The reactants are nitrogen and hydrogen, and the product is ammonia. If we look at this equation, we can see that the equation is not balanced.
  • N2 + H2 → NH3
• The equation is not balanced because, in the reactants side, there are 2 nitrogen (N) atoms and 2 hydrogen (H) atoms.
• In the products side, there are 1 nitrogen (N) atoms and 3 hydrogen (H) atoms. The number of atoms is not balanced on both sides.
• To balance the chemical equation above, we need to make use of coefficients.
• A coefficient is a number that we place in front of a chemical formula.
• In the chemical equation, to make the number of nitrogen (N) atoms equal on both sides, first, we place a coefficient of 2 in front of NH3.

N2 + H2 → 2NH3

• Once we do that, the number of nitrogen (N) atoms on both sides are balanced.
• However, the number of hydrogen (H) atoms is not balanced on both sides.
• We need to make use of another coefficient in front of H2. This time, we put a coefficient of 3 in front of H2 to balance the chemical equation.

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N2 + 3H2 → 2NH3 [Balance equation]

• The equation above is now balanced. There are 2 nitrogen (N) atoms and 6 hydrogen (H) atoms on both the reactants and products side.
• Since there is no coefficient in front of N2, that means the coefficient equal to 1.

UNBALANCED EQUATION BALANCED EQUATION CH4 + O2 → CO2 + H2O CH4 + 2O2 → CO2 + 2H2O Fe2O3 + C → Fe + CO2 2Fe2O3 + 3C → 4Fe + 3CO2 Mg + O2 → MgO 2Mg + O2 → 2MgO

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