Which of the following is a balanced chemical equation? Select one:

NaOH + H2CO3 → Na2CO3 + H2O

N2 + H2 → 2NH3

NH3 + HCl → NH4Cl

AlCl3 + Li → Al + LiCl​

NH3 + HCl → NH4Cl: this equation is balanced as it has one nitrogen atom, four hydrogen atoms and one chlorine atom at each side of the equation.

Explanation:

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In this case, according to the law of conservation of mass, we need to have the same number of atoms of each element at both sides of the equation; therefore we analyze each reaction:

NaOH + H2CO3 → Na2CO3 + H2O : three hydrogens at the left and two at the right, so this is not balanced.

N2 + H2 → 2NH3: two hydrogens at the left and six at the right, so this is not balanced.

NH3 + HCl → NH4Cl: this equation is balanced as it has one nitrogen atom, four hydrogen atoms and one chlorine atom at each side of the equation.

AlCl3 + Li → Al + LiCl​: three chlorines at the left and one of the right, so this is not balanced.

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