Question

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​

Answer 1

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.

Step-by-step explanation:

Hello there!

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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