The molecular weight of G-418 disulfate salt (C_{20}H_{40}N_{4}O_{10}.2H_{2}SO_{4}) is 692.71416.

G-418 (C_{20}H_{40}N_{4}O_{10}) is an organic compound of four elements: Carbon, Hydrogen, Nitrogen, and Oxygen. The G-418 disulfate salt (C_{20}H_{40}N_{4}O_{10}.2H_{2}SO_{4}) also contains two molecules of sulfuric acid. The molecular weight of G-418 disulfate salt is 692.71416 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

**CALCULATION PROCEDURE: G-418 disulfate salt [C**_{20}H_{40}N_{4}O_{10}.2H_{2}SO_{4}] Molecular Weight Calculation

_{20}H

_{40}N

_{4}O

_{10}.2H

_{2}SO

_{4}] Molecular Weight Calculation

**Step 1: Find out the chemical formula and determine constituent atoms and their number in a G-418 disulfate salt molecule.**You will know different atoms and their number in a G-418 disulfate salt molecule from the chemical formula. The chemical formula of G-418 disulfate salt is C

_{20}H

_{40}N

_{4}O

_{10}.2H

_{2}SO

_{4}. From the chemical formula, you can find that one molecule of G-418 disulfate salt consists of twenty Carbon (C) atoms, forty Hydrogen (H) atoms, four Nitrogen (N) atoms, ten Oxygen atoms, and two sulfuric acid molecules.

**Step 2: Find out the atomic weights of each atom (from the 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 Nitrogen (N): 14.00674 (Ref: Jlab-ele007)

Atomic weight of Oxygen (O): 15.9994 (Ref: Jlab-ele008)

Molecular weight of Sulfuric acid [H_{2}SO_{4}]: 98.0796 (see molecular weight calculation of Sulfuric acid [H_{2}SO_{4}])

**Step 3: Calculate the total weight of each atom in a G-418 disulfate salt molecule by multiplying its atomic weight by its number.**

Number of Carbon atoms in G-418 disulfate salt: 20

Atomic weight of Carbon (C): 12.0107

Total weight of Carbon atoms in G-418 disulfate salt: 12.0107 x 14 = 240.214

Number of Hydrogen atoms in G-418 disulfate salt: 40

Atomic weight of Hydrogen (H): 1.008

Total weight of Hydrogen atoms in G-418 disulfate salt: 1.008 x 40 = 40.32

Number of Nitrogen atoms in G-418 disulfate salt: 4

Atomic weight of Nitrogen (N): 14.00674

Total weight of Nitrogen atoms in G-418 disulfate salt: 14.00674 x 4 = 56.02696

Number of Oxygen atoms in G-418 disulfate salt: 10

Atomic weight of Oxygen (O): 15.9994

Total weight of Oxygen atoms in G-418 disulfate salt: 15.9994 x 10 = 159.994

Number of sulfuric acid molecules in G-418 disulfate salt: 2

Molecular weight of Sulfuric acid (H_{2}SO_{4}): 98.0796

Total weight of Sulfuric acid in G-418 disulfate salt: 36.4607 x 2 = 196.1592

**Step 4: Calculate the molecular weight of G-418 disulfate salt by adding up the total weight of all atoms.**

Molecular weight of G-418 disulfate salt: 240.214 (Carbon) + 40.32 (Hydrogen) + 56.02696 (Nitrogen) + 159.994 (Oxygen) + 196.1592 (Sulfuric acid) = 692.71416

So the molecular weight of G-418 disulfate salt is 692.71416.

G-418 disulfate salt [C_{20}H_{40}N_{4}O_{10}.2H_{2}SO_{4}] Molecular Weight Calculation

Molecular weight of G-418 disulfate salt [C_{20}H_{40}N_{4}O_{10}.2H_{2}SO_{4}] | |||

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

Carbon (C) | 20 | 12.0107 | 240.214 |

Hydrogen (H) | 40 | 1.008 | 40.32 |

Nitrogen (N) | 4 | 14.00674 | 56.02696 |

Oxygen (O) | 10 | 15.9994 | 159.994 |

Hydrogen chloride (HCl) | 2 | 98.0796 | 196.1592 |

Molecular weight of G-418 disulfate salt [C_{20}H_{40}N_{4}O_{10}.2H_{2}SO_{4}]: | 692.71416 |

## REFERENCES:

- Lanl-1: https://periodic.lanl.gov/1.shtml
- Jlab-ele006: https://education.jlab.org/itselemental/ele006.html
- Jlab-ele007: https://education.jlab.org/itselemental/ele007.html
- Jlab-ele008: https://education.jlab.org/itselemental/ele008.html
- Jlab-ele016: https://education.jlab.org/itselemental/ele016.html