The molecular weight of Ethyl formate [HCOOC₂H₅] is 74.0789.

To calculate molecular weight of any compound, the first step is to know the constituent atoms and their number in that particular compound. Then calculate the total weight of each atom by multiplying its atomic weight by its number. The sum of total weight of all constituent atoms will be the molecular weight of the compound. Note that the value of atomic weight may differ slightly from different sources.

CALCULATION PROCEDURE: Ethyl formate [HCOOC₂H₅] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in a Ethyl formate molecule.
From the chemical formula, you will know different atoms and their number in a Ethyl formate molecule. Chemical formula of Ethyl formate is C₃H₆O₂. From the chemical formula of Ethyl formate, you can find that one molecule of Ethyl formate has three Carbon (C) atoms, six Hydrogen (H) atoms and two Oxygen (O) atoms.

Step 2: Find out atomic weights of each atom (from periodic table).

Atomic weight of Carbon (C): 12.0107 (Ref: Jlab-ele006)
Atomic weight of Hydrogen (H) : 1.008 (Ref: Lanl-1)
Atomic weight of Oxygen (O) : 15.9994 (Ref: Jlab-ele008)

Step 3: Calculate the total weight of each atom present in a Ethyl formate molecule by multiplying its atomic weight by its number.

Number of Carbon atoms in Ethyl formate: 3
Atomic weight of Carbon (C): 12.0107
Total weight of Carbon atoms in Ethyl formate: 12.0107 x 3 = 36.0321

Number of Hydrogen atoms in Ethyl formate: 6
Atomic weight of Hydrogen (H): 1.008
Total weight of Hydrogen atoms in Ethyl formate: 1.008 x 6 = 6.048

Number of Oxygen atoms in Ethyl formate: 2
Atomic weight of Oxygen (O): 15.9994
Total weight of Oxygen atoms in Ethyl formate: 15.9994 x 2 = 31.9988

Step 4: Calculate the molecular weight of Ethyl formate by adding up the total weight of all atoms.

Molecular weight of Ethyl formate: 36.0321 (Carbon) + 6.048 (Hydrogen) + 31.9988 (Oxygen) = 74.0789

So the molecular weight of Ethyl formate is 74.0789.

Ethyl formate [HCOOC₂H₅] Molecular Weight Calculation

REFERENCES:

• Lanl-1: https://periodic.lanl.gov/1.shtml 
• Pubchem-Hydrogen : https://pubchem.ncbi.nlm.nih.gov/element/Hydrogen 
• Jlab-ele006; https://education.jlab.org/itselemental/ele006.html
• Pubchem-6: https://pubchem.ncbi.nlm.nih.gov/element/6
• Jlab-ele008: https://education.jlab.org/itselemental/ele008.html
• Pubchem-8: https://pubchem.ncbi.nlm.nih.gov/element/8

See also:

• Apiose (C5H10O5) Molecular Weight Calculation