1. What is Molecular Weight given Initial Vapour Density?

Definition: This calculator determines the molecular weight of a substance based on its initial vapour density and the volume of solution.

Purpose: It helps chemists and researchers estimate molecular weights when working with gaseous substances or solutions.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( MW \) — Molecular Weight (kg)
• \( D \) — Initial Vapour Density
• \( V \) — Volume of Solution (m³)

Explanation: The molecular weight is calculated by multiplying the initial vapour density by the volume of the solution.

3. Importance of Molecular Weight Calculation

Details: Knowing the molecular weight is crucial for stoichiometric calculations, determining reaction yields, and understanding physical properties of substances.

4. Using the Calculator

Tips: Enter the initial vapour density and volume of solution (in cubic meters). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is initial vapour density?
A: Initial vapour density is the density of a vapour substance during the initial stages of reaction, typically measured relative to hydrogen or air.

Q2: Why is volume in cubic meters?
A: The SI unit for volume in scientific calculations is cubic meters, though you can convert from liters (1 m³ = 1000 L).

Q3: Can this be used for any substance?
A: This calculation works best for ideal gases and substances where vapour density can be accurately measured.

Q4: How accurate is this method?
A: Accuracy depends on precise measurement of vapour density and volume. For complex molecules, other methods may be more accurate.

Q5: What's the relationship between vapour density and molecular weight?
A: Vapour density is directly proportional to molecular weight for ideal gases (MW = 2 × Vapour Density relative to H₂).