Theoretical Molecular Weight Formula:
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Definition: This calculator determines the theoretical molecular weight of a substance based on its initial vapour density.
Purpose: It helps chemists and researchers estimate molecular weight during the early stages of chemical reactions when vapour density measurements are available.
The calculator uses the formula:
Where:
Explanation: The initial vapour density is multiplied by 2 to obtain the theoretical molecular weight of the substance.
Details: Calculating theoretical molecular weight helps in predicting reaction outcomes, understanding molecular structures, and verifying experimental results.
Tips: Enter the initial vapour density value. The value must be > 0.
Q1: What is vapour density?
A: Vapour density is the density of a vapour relative to that of hydrogen under the same conditions.
Q2: Why multiply by 2 in the formula?
A: The factor of 2 comes from the molecular weight of hydrogen (H₂), which is used as the reference standard for vapour density measurements.
Q3: How accurate is this calculation?
A: This provides a theoretical value. Actual molecular weight may vary due to experimental conditions and molecular interactions.
Q4: Can this be used for all substances?
A: This calculation is most accurate for ideal gases and may need adjustment for complex molecules or non-ideal conditions.
Q5: What units does this calculator use?
A: The calculator returns molecular weight in kilograms (kg).