which equation is balanced?\no mg3n2 + h2o → 3mgo + 2nh3\no c3h8 + 5o2 → h2o + 3co2\no zn + 2hcl → zncl2 +…

Explanation:

Step1: Check Mg₃N₂ + H₂O → 3MgO + 2NH₃

On the left - hand side, there are 3 Mg, 2 N, 2 H, 1 O. On the right - hand side, there are 3 Mg, 2 N, 6 H, 4 O. The number of H and O atoms is not balanced.

Step2: Check C₃H₈ + 5O₂ → H₂O + 3CO₂

On the left - hand side, there are 3 C, 8 H, 10 O. On the right - hand side, there are 3 C, 2 H, 7 O. The number of H and O atoms is not balanced.

Step3: Check Zn + 2HCl → ZnCl₂ + H₂

On the left - hand side, there is 1 Zn, 2 H, 2 Cl. On the right - hand side, there is 1 Zn, 2 H, 2 Cl. The equation is balanced.

Step4: Check 3H₂SO₄ + 2Fe → Fe₂(SO₄)₃ + H₂

On the left - hand side, there are 6 H, 3 S, 12 O, 2 Fe. On the right - hand side, there are 2 H, 3 S, 12 O, 2 Fe. The number of H atoms is not balanced.

Answer:

Zn + 2HCl → ZnCl₂ + H₂