The molecular weight of Malonic acid (CH_{2}(COOH)_{2}) is 104.0617.

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: Malonic acid (CH**_{2}(COOH)_{2}) Molecular Weight Calculation

_{2}(COOH)

_{2}) Molecular Weight Calculation

**Step 1: Find out the chemical formula and determine constituent atoms and their number in a Malonic acid molecule.**From the chemical formula, you will know different atoms and their number in a Malonic acid molecule. Chemical formula of Malonic acid is C

_{3}H

_{4}O

_{4}. From the chemical formula of Malonic acid, you can find that one molecule of Malonic acid has three Carbon (C) atoms, four Hydrogen (H) atoms and four 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 Malonic acid molecule by multiplying its atomic weight by its number.**

Number of Carbon atoms in Malonic acid: 3

Atomic weight of Carbon: 12.0107

Total weight of Carbon atoms in Malonic acid: 12.0107 x 3 = 36.0321

Number of Hydrogen atoms in Malonic acid: 4

Atomic weight of Hydrogen: 1.008

Total weight of Hydrogen atoms in Malonic acid: 1.008 x 4 = 4.0321

Number of Oxygen atoms in Malonic acid: 4

Atomic weight of Oxygen: 15.9994

Total weight of Oxygen atoms in Malonic acid: 15.9994 x 4 = 63.9976

**Step 4: Calculate the molecular weight of Malonic acid by adding up the total weight of all atoms. **

Molecular weight of Malonic acid: 36.0321 (Carbon) + 4.0321 (Hydrogen) + 63.9976 (Oxygen) = 104.0617

So the molecular weight of Malonic acid is 104.0617.

Malonic acid (CH_{2}(COOH)_{2}) Molecular Weight Calculation

Molecular weight of Malonic acid | |||

Constituent atoms | Number of each atom | Atomic weight | Total weight |

Carbon (C) | 3 | 12.0107 | 36.0321 |

Hydrogen (H) | 4 | 1.008 | 4.0321 |

Oxygen (O) | 4 | 15.9994 | 63.9976 |

Molecular weight of Malonic acid: | 104.0617 |

## 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