What is the chemical equation of a copper penny?

Here's the breakdown of a modern US penny's composition:

* 銅： 97.5%

* Zinc: 2.5%

Therefore, there's no single chemical equation for a copper penny. However, we can represent the components:

* 銅： cu

* Zinc: Zn

So, a simplified way to represent the composition of a copper penny would be:

Cu (97.5%) + Zn (2.5%)

It's important to note that this is not a chemical reaction, but rather a representation of the alloy's composition.