Which formula denotes the simplest positive integer ratio of atoms present in a compound?

Options

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

Explanation

To solve the question "Which formula denotes the simplest positive integer ratio of atoms present in a compound?", we need to understand the different types of chemical formulas and identify which one represents the simplest ratio of atoms.

### Step-by-Step Solution:

1. **Understand the Types of Formulas**:
- **Molecular Formula**: This formula shows the actual number of atoms of each element in a molecule. For example, the molecular formula of glucose is C₆H₁₂O₆, which indicates there are 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms.
- **Empirical Formula**: This formula represents the simplest whole number ratio of the elements in a compound. For glucose, the empirical formula can be derived from the molecular formula.

2. **Calculate the Empirical Formula**:
- From the molecular formula C₆H₁₂O₆, we have:
- Carbon (C): 6
- Hydrogen (H): 12
- Oxygen (O): 6
- To find the simplest ratio, we divide each number by the greatest common divisor (GCD) of these numbers. In this case, the GCD is 6.
- C: 6/6 = 1
- H: 12/6 = 2
- O: 6/6 = 1
- Thus, the empirical formula is CH₂O.

3. **Identify the Correct Answer**:
- Since the empirical formula (CH₂O) represents the simplest positive integer ratio of the atoms present in glucose, the answer to the question is the empirical formula.

4. **Evaluate Other Options**:
- **Empirical Formula Mass**: This is the sum of the atomic masses of the elements in the empirical formula and does not represent a ratio.
- **Percentage Composition**: This indicates the percentage of each element in the compound but does not provide a ratio of atoms.

### Conclusion:
The formula that denotes the simplest positive integer ratio of atoms present in a compound is the **Empirical Formula**.

### Final Answer:
**Empirical Formula (Option B)**

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