Mayonnaise doesn't have a single chemical formula. It's a complex emulsion of oil, egg yolk, vinegar, and seasonings. Here's a breakdown of the main components:

* Oil: Typically a blend of vegetable oils like soybean, canola, or sunflower oil. These are composed of various fatty acids like oleic acid, linoleic acid, and palmitic acid, but their exact proportions vary depending on the oil used.

* Egg yolk: Contains lecithin, a phospholipid that acts as an emulsifier, along with proteins, fats, and water.

* Vinegar: Primarily water with acetic acid, along with trace amounts of other acids and sugars.

* Seasonings: Salt, sugar, and sometimes mustard are added for flavor.

So, while you can't write a single formula for mayonnaise, the key components are:

* Fats: From the oil and egg yolk

* Water: From the vinegar and egg yolk

* Proteins: Primarily from the egg yolk

* Other components: Acids (acetic acid from vinegar), salts, sugars, and emulsifiers (like lecithin)

It's important to remember that mayonnaise is a complex mixture, not a pure substance with a fixed chemical formula.