Hydrogen + oxygen --> water
2,1g + 16,8g = x
x = 18,9g
Answer: Rotation cause by the earths orbit and gravity
Explanation:
Because <span>Gold is a very inert metal, and won't really react with oxygen in the air.
The only reason other metals tarnish, such as copper, silver, steel/iron, is
because they're freely reacting with air, to produce a metal oxide surface layer. </span>