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The page includes two main questions:

1. **Empirical Formula Calculations (Question 3.49)**:
   - The goal is to determine the empirical formulas of compounds based on given percentage compositions.
   - The specific compounds and compositions given are:
     - (a) 2.1% H, 65.3% O, and 32.6% S, which results in the empirical formula **H2SO3**.
     - (b) 20.2% Al and 79.8% Cl, which results in the empirical formula **AlCl3**.

2. **Balancing Chemical Equations (Question 3.59)**:
   - Various chemical equations are provided to be balanced. The balanced forms are:
     - (a) \(2 \text{C} + \text{O}_2 \rightarrow 2 \text{CO}\)
     - (b) \(2 \text{CO} + \text{O}_2 \rightarrow 2 \text{CO}_2\)
     - (c) \( \text{H}_2 + \text{Br}_2 \rightarrow 2 \text{HBr}\)
     - (d) \( 2 \text{K} + 2 \text{H}_2\text{O} \rightarrow 2 \text{KOH} + \text{H}_2\)
     - (e) \( 2 \text{Mg} + \text{O}_2 \rightarrow 2 \text{MgO}\)
     - (f) \( 2 \text{O}_3 \rightarrow 3 \text{O}_2\)
     - (g) \( 2 \text{H}_2\text{O}_2 \rightarrow 2 \text{H}_2\text{O} + \text{O}_2\)
     - (h) \( \text{N}_2 + 3 \text{H}_2 \rightarrow 2 \text{NH}_3\)
     - (i) \( \text{Zn} + 2 \text{AgCl} \rightarrow \text{ZnCl}_2 + 2 \text{Ag}\)
     - (j) \( 2 \text{SO}_2 + \text{O}_2 \rightarrow 2 \text{SO}_3\)
     - (k) \( 2 \text{NaOH} + \text{H}_2\text{SO}_4 \rightarrow \text{Na}_2\text{SO}_4 + 2 \text{H}_2\text{O}\)
     - (l) \( 2 \text{Cl}_2 + 2 \text{NaI} \rightarrow 2 \text{NaCl} + \text{I}_2\)
     - (m) \( 3 \text{KOH} + \text{H}_3\text{PO}_4 \rightarrow \text{K}_3\text{PO}_4 + 3 \text{H}_2\text{O}\)
     - (n) \( \text{CH}_4 + 2 \text{Br}_2 \rightarrow \text{CBr}_4 + 4 \text{HBr}\)

Would you like any details on the empirical formula calculations or the steps in balancing any of these equations?

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### Related Questions:
1. How do you calculate empirical formulas based on percentage composition?
2. What are the steps to balance a chemical equation systematically?
3. How can you convert a molecular formula into an empirical formula?
4. What techniques help in balancing equations with polyatomic ions?
5. How do oxidation states affect the balancing of redox reactions?

### Tip:
When balancing chemical equations, always start by balancing elements that appear in only one reactant and one product before moving to more complex molecules.

What are the empirical formulas of compounds with the following compositions: (a) 2.1 percent H, 65.3 percent O, and 32.6 percent S; (b) 20.2 percent Al, and 79.8 percent Cl? Also, balance the following chemical equations.

Learn how to determine the empirical formulas of compounds based on percentage composition and balance various chemical equations. This problem explores key chemistry concepts, including stoichiometry and the conservation of mass, making it ideal for students in Grades 10-12.

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