The molecular weight of Methyl propiolate (HC₂CO₂CH₃) is 84.0736.

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: Methyl propiolate (HC₂CO₂CH₃) Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in a Methyl propiolate molecule.
From the chemical formula, you will know different atoms and their number in a Methyl propiolate molecule. Chemical formula of Methyl propiolate is C₄H₄O₂. From the chemical formula of Methyl propiolate, you can find that one molecule of Methyl propiolate has four Carbon (C) atoms, four 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 Methyl propiolate molecule by multiplying its atomic weight by its number.

Number of Carbon atoms in Methyl propiolate: 4
Atomic weight of Carbon: 12.0107
Total weight of Carbon atoms in Methyl propiolate: 12.0107 x 4 = 48.0428

Number of Hydrogen atoms in Methyl propiolate: 4
Atomic weight of Hydrogen: 1.008
Total weight of Hydrogen atoms in Methyl propiolate: 1.008 x 4 = 4.032

Number of Oxygen atoms in Methyl propiolate: 2
Atomic weight of Oxygen: 15.9994
Total weight of Oxygen atoms in Methyl propiolate: 15.9994 x 2 = 31.9988

Step 4: Calculate the molecular weight of Methyl propiolate by adding up the total weight of all atoms.

Molecular weight of Methyl propiolate: 48.0428 (Carbon) + 4.032 (Hydrogen) + 31.9988 (Oxygen) = 84.0736

So the molecular weight of Methyl propiolate is 84.0736.

Methyl propiolate (HC₂CO₂CH₃) 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