A organic compound contains 4% sulphur. Its minimum molecular weight is

Options

A. 200
B. 400
C. 800
D. 1600

Explanation

To find the minimum molecular weight of an organic compound that contains 4% sulfur, we can follow these steps:

### Step 1: Understand the Percentage Composition
The problem states that the organic compound contains 4% sulfur. This means that in 100 grams of the compound, there are 4 grams of sulfur.

### Step 2: Determine the Mass of Sulfur in Terms of Molecular Weight
Let the molecular weight of the organic compound be \( x \) grams. Since we know that 4% of this mass is sulfur, we can express this mathematically:
\[ \text{Mass of Sulfur} = \frac{4}{100} \times x = 0.04x \]

### Step 3: Relate the Mass of Sulfur to Its Atomic Weight
The atomic weight of sulfur (S) is approximately 32 grams/mol. Therefore, we can set up the equation:
\[ 0.04x = 32 \]

### Step 4: Solve for the Molecular Weight \( x \)
To find \( x \), we can rearrange the equation:
\[ x = \frac{32}{0.04} \]
Calculating this gives:
\[ x = 800 \text{ grams/mol} \]

### Conclusion
Thus, the minimum molecular weight of the organic compound is **800 grams/mol**.

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