Independent group 123456789
Answer:
Helium, this noble gas has the least density at STP
Explanation:
The chemical breakdown of enormous quantities of organic material buried in the sedimentary rocks has produced ethane gas.
A chemical equation is a short hand expression of a chemical reaction. There aretwo<span> parts to a chemical equation. The reactants are the elements or compounds on the left side of the arrow (-->). The elements and compounds to the right of the arrow are the products.</span>