The equivalent mass of HCl in the given reaction is:

Options

A. 16.25
B. 36.5
C. 73
D. 85.1

Answer

To find the equivalent mass of HCl in the given reaction, we can follow these steps:

### Step 1: Identify the molecular weight of HCl
The molecular weight of HCl can be calculated by adding the atomic masses of hydrogen (H) and chlorine (Cl).
- Atomic mass of H = 1 g/mol
- Atomic mass of Cl = 35.5 g/mol

**Calculation:**
Molecular weight of HCl = Atomic mass of H + Atomic mass of Cl
Molecular weight of HCl = 1 g/mol + 35.5 g/mol = 36.5 g/mol

### Step 2: Determine the n-factor for HCl
The n-factor of an acid like HCl is defined as the number of moles of H+ ions it can produce in a reaction. Since HCl dissociates completely in solution to produce one H+ ion, its n-factor is 1.

**Conclusion:**
n-factor of HCl = 1

### Step 3: Calculate the equivalent mass of HCl
The equivalent mass (or equivalent weight) of a substance can be calculated using the formula:
\[ \text{Equivalent mass} = \frac{\text{Molecular weight}}{\text{n-factor}} \]

**Calculation:**
Equivalent mass of HCl = Molecular weight of HCl / n-factor
Equivalent mass of HCl = 36.5 g/mol / 1 = 36.5 g/equiv

### Final Answer:
The equivalent mass of HCl in the given reaction is **36.5 g/equiv**.

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