How much of the following are strong electrolytes?
a. `NH_(3)` b. `NH_(4)Cl` c. `CH_(3)COOH`
d. `CH_(3)COONa` e. `HCl` f. `NaCl`

Explanation

To determine how many of the given substances are strong electrolytes, we need to analyze each compound based on its dissociation in water.

### Step-by-Step Solution:

1. **Identify Strong Electrolytes**: Strong electrolytes are substances that completely dissociate into ions when dissolved in water. Common examples include strong acids, strong bases, and soluble salts.

2. **Evaluate Each Compound**:
- **a. `NH₃` (Ammonia)**:
- Ammonia is a weak base and does not completely dissociate in water. Therefore, it is **not a strong electrolyte**.

- **b. `NH₄Cl` (Ammonium Chloride)**:
- Ammonium chloride is a salt that completely dissociates into `NH₄⁺` and `Cl⁻` ions in solution. Thus, it is a **strong electrolyte**.

- **c. `CH₃COOH` (Acetic Acid)**:
- Acetic acid is a weak acid and only partially dissociates in water. Therefore, it is **not a strong electrolyte**.

- **d. `CH₃COONa` (Sodium Acetate)**:
- Sodium acetate is a salt that completely dissociates into `CH₃COO⁻` and `Na⁺` ions in solution. Thus, it is a **strong electrolyte**.

- **e. `HCl` (Hydrochloric Acid)**:
- Hydrochloric acid is a strong acid and completely dissociates in water into `H⁺` and `Cl⁻` ions. Therefore, it is a **strong electrolyte**.

- **f. `NaCl` (Sodium Chloride)**:
- Sodium chloride is a salt that completely dissociates into `Na⁺` and `Cl⁻` ions in solution. Thus, it is a **strong electrolyte**.

3. **Conclusion**:
- The strong electrolytes from the list are:
- `NH₄Cl`
- `CH₃COONa`
- `HCl`
- `NaCl`
- The weak electrolytes are:
- `NH₃`
- `CH₃COOH`

### Summary of Strong Electrolytes:
- **Strong Electrolytes**: `NH₄Cl`, `CH₃COONa`, `HCl`, `NaCl`
- **Weak Electrolytes**: `NH₃`, `CH₃COOH`