Balance the following equations:
(a) CaS(s) + H₂O(l) → Ca(HS₂)₂(aq) + Ca(OH)₂(aq)
(b) NH₃(g) + O₂(g) → NO(g) + H₂O(g)
(c) FeCl₃(s) + Na₂CO₃(aq) → Fe₂(CO₃)₃(s) + NaCl(aq)
(d) FeS₂(s) + O₂(g) → Fe₂O₃(s) + SO₂(g)

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Identify the number of each type of atom on both sides of the equation. For NH₃ + O₂ → NO + H₂O, count N, H, and O atoms.

Start by balancing the nitrogen (N) atoms. There is 1 N atom in NH₃ and 1 N atom in NO. They are already balanced.

Next, balance the hydrogen (H) atoms. There are 3 H atoms in NH₃ and 2 H atoms in H₂O. To balance, adjust the coefficients of NH₃ and H₂O.

Now, balance the oxygen (O) atoms. Count the O atoms in O₂, NO, and H₂O. Adjust the coefficients to ensure the same number of O atoms on both sides.

Check all atoms again to ensure they are balanced. Adjust coefficients as necessary to achieve a balanced equation.

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Balancing Chemical Equations

Balancing chemical equations involves ensuring that the number of atoms for each element is the same on both sides of the equation. This is based on the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. Coefficients are used to adjust the quantities of reactants and products to achieve balance.

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