Here's a breakdown:

* C6H7O6Na: Represents the basic repeating unit of the alginate molecule.

* n: Indicates that the molecule is a polymer, meaning it's made up of many repeating units linked together. The value of 'n' can vary, resulting in different chain lengths and molecular weights of sodium alginate.

Sodium alginate is a natural polysaccharide extracted from seaweed. It is commonly used as a thickener, emulsifier, and stabilizer in food and other industries.