1. What is Selectivity in Chemistry?

Definition: Selectivity of a reaction is the ratio of the desired product formed (in moles) to the undesired product formed (in moles).

Purpose: It measures how efficiently a reaction produces the desired product relative to unwanted byproducts.

2. How Does the Selectivity Calculator Work?

The calculator uses the formula:

Where:

• \( S \) — Selectivity (%)
• \( M_{Desired} \) — Moles of desired product (moles)
• \( M_{Undesired} \) — Moles of undesired product (moles)

Explanation: The moles of desired product are divided by moles of undesired product, then multiplied by 100 to get a percentage.

3. Importance of Selectivity Calculation

Details: High selectivity means more efficient reactions with less waste, which is crucial for industrial processes and green chemistry.

4. Using the Calculator

Tips: Enter the moles of desired product and moles of undesired product. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What does 100% selectivity mean?
A: 100% selectivity means all reactants were converted to the desired product with no byproducts formed.

Q2: Can selectivity be greater than 100%?
A: Yes, if more desired product is formed than undesired product (ratio > 1).

Q3: How is selectivity different from yield?
A: Yield measures total product formed from reactants, while selectivity compares desired vs undesired products.

Q4: What factors affect selectivity?
A: Temperature, catalysts, reactant concentrations, and reaction mechanisms all influence selectivity.

Q5: How can I improve selectivity?
A: Use selective catalysts, optimize reaction conditions, or modify reactant structures.