What is the chemical equation for why the Statue of Liberty turned green

The reason copper coins dull in the first place, is because copper reacts with oxygen in the air and form a layer of copper oxide which is a dull greenish-grey colour. When you mix the salt (sodium chloride) with the vinegar (acetic acid) you form Sodium acetate and Hydrogen chloride.

The formula is as follows

2Cu + O2 ---> 2CuO

When two copper atoms react with a diatonic oxygen, they form copper oxide (rust)

5.2 km to mm.
1km = 1000m
= 5.2 * 1000m.
=5200 m.                  1m = 1000mm

= 5200 * 1000mm
= 5200000 mm