The earliermethod for determining the molecular weight of proteins was based on chemical analysis. The following composition of proteins were found :
Haemoglobin: 0.335% Fe
Cytochrome protein: 0.376% Fe
Peroxidase enzyme : 0.29% Se
If the cytochrome protein contains one atom per molecule then the molecular mass of protein is

Options

A. 14850 u
B. 29600 u
C. 32960 u
D. 12840 u

Explanation

To determine the molecular mass of the cytochrome protein based on the given percentage of iron (Fe), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Given Data**:
- The percentage of iron (Fe) in cytochrome protein is given as 0.376%.
- It is stated that there is one atom of iron per molecule of cytochrome protein.

2. **Set Up the Equation**:
- Let the molecular mass of the cytochrome protein be denoted as \( x \) grams per mole.
- The mass of iron in one molecule of cytochrome protein can be expressed as:
\[ \text{Mass of Fe in one molecule} = \frac{x \times 0.376}{100} \]

3. **Use the Atomic Mass of Iron**:
- The atomic mass of iron (Fe) is approximately 55.85 g/mol.
- Since there is one atom of iron per molecule, we can set the mass of Fe equal to its atomic mass:
\[ \frac{x \times 0.376}{100} = 55.85 \]

4. **Rearrange the Equation**:
- To find \( x \), rearrange the equation:
\[ x \times 0.376 = 55.85 \times 100 \]
\[ x \times 0.376 = 5585 \]

5. **Solve for \( x \)**:
- Divide both sides by 0.376:
\[ x = \frac{5585}{0.376} \]
- Calculating this gives:
\[ x \approx 14853.723 \]

6. **Conclusion**:
- The molecular mass of the cytochrome protein is approximately **14853.723 g/mol**.