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Here are the balanced chemical equations:
(a) 2 N₂O₅ → 2 N₂O₄ + O₂
(b) 4 KNO₃ → 2 K₂O + 2 N₂ + 5 O₂
(c) 2 NH₄NO₃ → N₂O + 4 H₂O
(d) 2 NH₄NO₂ → N₂ + 4 H₂O
(e) 2 NaHCO₃ → Na₂CO₃ + H₂O + CO₂
Explanation:
To balance chemical equations, you need to make sure that the number of atoms of each element on the reactants' side (left side) equals the number of atoms of that element on the products' side (right side). You do this by adding coefficients (numbers in front of the chemical formulas).
For example, in equation (a), there are 2 nitrogen atoms and 10 oxygen atoms on the left side, and 2 nitrogen atoms and 9 oxygen atoms on the right side. To balance it, we add a coefficient of 2 in front of N₂O₅ and N₂O₄ on the left and right sides, respectively. This gives us 2 nitrogen atoms and 10 oxygen atoms on both sides of the equation.