Molecular Weight Formula:
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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.
The calculator uses the formula:
Where:
Explanation: The molecular weight is calculated by multiplying the initial vapour density by the volume of the solution.
Details: Knowing the molecular weight is crucial for stoichiometric calculations, determining reaction yields, and understanding physical properties of substances.
Tips: Enter the initial vapour density and volume of solution (in cubic meters). All values must be > 0.
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).