For how many of the following protic acids, mass of one gm equivalent is equal to molar mass.
`Hcl, NHO_(3), H_(2)SO_(4), H_(3)PO_(4), H_(3)PO_(3), H_(3)PO_(2), H_(3)NO_(2), CH_(3)COOH, H_(2)SO_(3)`.

Explanation

To determine how many of the given protic acids have a mass of one gram equivalent equal to their molar mass, we need to understand the concept of gram equivalent and basicity.

### Step-by-Step Solution:

1. **Understanding Gram Equivalent**:
- The gram equivalent of an acid is defined as the molar mass divided by its basicity.
- Basicity refers to the total number of H⁺ ions that an acid can donate.

2. **Condition for the Problem**:
- The problem states that the mass of one gram equivalent is equal to the molar mass. This implies that the basicity of the acid must be 1 (since Molar Mass / Basicity = Molar Mass when Basicity = 1).

3. **Analyzing Each Acid**:
- We will analyze each acid to determine its basicity:

a. **HCl**:
- Basicity = 1 (can donate 1 H⁺).
- Considered.

b. **HNO₃**:
- Basicity = 1 (can donate 1 H⁺).
- Considered.

c. **H₂SO₄**:
- Basicity = 2 (can donate 2 H⁺).
- Not considered.

d. **H₃PO₄**:
- Basicity = 3 (can donate 3 H⁺).
- Not considered.

e. **H₃PO₃**:
- Basicity = 3 (can donate 3 H⁺).
- Not considered.

f. **H₃PO₂**:
- Basicity = 2 (can donate 2 H⁺).
- Not considered.

g. **H₃NO₂**:
- Basicity = 2 (can donate 2 H⁺).
- Not considered.

h. **CH₃COOH (Acetic Acid)**:
- Basicity = 1 (can donate 1 H⁺).
- Considered.

i. **H₂SO₃**:
- Basicity = 2 (can donate 2 H⁺).
- Not considered.

4. **Final Count**:
- The acids that have a basicity of 1 are: HCl, HNO₃, and CH₃COOH.
- Therefore, the total number of acids for which the mass of one gram equivalent is equal to the molar mass is **3**.

### Summary:
The acids for which the mass of one gram equivalent is equal to the molar mass are:
- HCl
- HNO₃
- CH₃COOH

Thus, the answer is **3**.