1. Ethyl Acetate Formula and Molecular Weight
Ethyl acetate has the chemical formula C₄H₈O₂ and a molecular weight of approximately 88.11.
| Property | Information |
|---|---|
| Chemical Name | Ethyl Acetate |
| Chemical Formula | C₄H₈O₂ |
| CAS No. | 141-78-6 |
| Molecular Weight | 88.11 |
| Formula Weight | 88.11 |
| Molar Mass | 88.11 g/mol |
2. What Is the Molecular Weight of Ethyl Acetate?
Ethyl acetate has a molecular weight of approximately 88.11, a relative value expressing the mass of one molecule compared to the atomic mass unit, with no unit attached. It's calculated by adding up the atomic weights of every atom in the molecule - 4 carbon, 8 hydrogen, and 2 oxygen atoms (C₄H₈O₂). For technical and formulation calculations, this is the figure used to compare ethyl acetate against other solvents or to work out stoichiometric ratios in a reaction.
3. What Is the Formula Weight of Ethyl Acetate?
Ethyl acetate has a formula weight of approximately 88.11, calculated as the sum of the atomic weights of all atoms shown in its chemical formula:
- 4 × Carbon (≈12.01) = 48.04
- 8 × Hydrogen (≈1.008) = 8.06
- 2 × Oxygen (≈16.00) = 32.00
Total ≈ 88.11
For a molecular compound like ethyl acetate, formula weight and molecular weight arrive at the same number - the difference is in what the term technically refers to, which is explained in Section 6.
4. What Is the Molar Mass of Ethyl Acetate?
Ethyl acetate has a molar mass of approximately 88.11 g/mol, adding a physical unit to the same underlying number used in Sections 2 and 3. In practice, this means 1 mole of ethyl acetate weighs approximately 88.11 grams - the figure used whenever a real quantity, such as kilograms, drums, or tank volumes, needs to be converted to or from moles for a chemical calculation.
5. Molecular Weight vs. Formula Weight vs. Molar Mass
Ethyl acetate's three related figures - molecular weight, formula weight, and molar mass - are numerically the same but describe different quantities.
| Term | Meaning | Unit | Ethyl Acetate |
|---|---|---|---|
| Molecular Weight | Relative molecular mass | None | 88.11 |
| Formula Weight | Sum of atomic weights | None | 88.11 |
| Molar Mass | Mass per mole | g/mol | 88.11 g/mol |
6. Why Are the Three Values Numerically the Same?
Ethyl acetate's molecular weight, formula weight, and molar mass are numerically the same because ethyl acetate is a molecular compound - its formula (C₄H₈O₂) represents an actual, discrete molecule, not just a simplified atomic ratio (as is the case for ionic compounds, where formula weight and molecular weight can diverge conceptually). While the number 88.11 stays consistent across all three terms:
- Molecular weight describes it as a relative, unitless comparison of molecular mass.
- Formula weight describes it as the calculated sum of atomic weights.
- Molar mass describes it as an actual physical quantity - grams per mole.
Knowing which term applies in a given context matters for technical documentation and lab reporting, even though the value itself doesn't change for a compound like ethyl acetate.
7. How Is Ethyl Acetate Molar Mass Used?
Ethyl acetate's molar mass serves as the conversion factor between moles and mass, the two units most chemical calculations move between:
Mass = Moles × Molar Mass Moles = Mass ÷ Molar Mass
Example: 100 mol × 88.11 g/mol = 8,811 g ≈ 8.811 kg
This kind of conversion is used in formulation dosing, reaction stoichiometry, and lab-scale calculations before quantities are scaled up to production or purchasing volumes.
8. Frequently Asked Questions
What is the molecular weight of ethyl acetate?
Ethyl acetate has a molecular weight of approximately 88.11.
What is the formula weight of ethyl acetate?
Ethyl acetate has a formula weight of approximately 88.11, calculated from the sum of its atomic weights (C₄H₈O₂).
What is the molar mass of ethyl acetate?
Ethyl acetate has a molar mass of approximately 88.11 g/mol.
Is molecular weight the same as molar mass?
Ethyl acetate's molecular weight and molar mass are numerically the same - both equal approximately 88.11 - but molecular weight is a relative, unitless value, while molar mass is expressed in grams per mole (g/mol).
How many grams are in one mole of ethyl acetate?
Ethyl acetate weighs approximately 88.11 grams per mole.
9. Conclusion
Ethyl acetate has a molecular weight of approximately 88.11 and a molar mass of approximately 88.11 g/mol, while its formula weight represents the corresponding calculated mass derived from its atomic composition (C₄H₈O₂). The three terms converge on the same number for this compound, but each describes a distinct concept - relative mass, calculated atomic sum, and mass per mole, respectively.
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