Which formula denotes the actual number of different elements present in one molecule of compound?

Options

A. Molecular formula
B. Empirical formula
C. Empirical formula mass
D. Percentage

Explanation

To determine which formula denotes the actual number of different elements present in one molecule of a compound, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definitions**:
- **Molecular Formula**: This formula represents the actual number of atoms of each element in a molecule of a compound.
- **Empirical Formula**: This formula gives the simplest whole number ratio of the different atoms in the compound, not the actual number.
- **Empirical Formula Mass**: This is the mass of the empirical formula, which does not relate to the number of elements.

2. **Identify the Options**:
- The options provided are:
- Molecular Formula
- Empirical Formula
- Empirical Formula Mass
- Percentage

3. **Analyze the Options**:
- The **molecular formula** provides the exact number of each type of atom in a molecule. For example, in glucose (C6H12O6), the molecular formula indicates there are 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms.
- The **empirical formula** (for glucose, CHO) simplifies this to the lowest ratio, which does not reflect the actual number of atoms.
- **Empirical formula mass** and **percentage** do not provide information about the number of different elements.

4. **Conclusion**:
- Based on the definitions and analysis, the formula that denotes the actual number of different elements present in one molecule of a compound is the **Molecular Formula**.

### Final Answer:
The correct answer is **Molecular Formula**.

---