Answer:
Don’t change, keep the same
Explanation:
Answer:
It represents the <em>number of atoms</em> of that particular element present in the compound. In C₂H₄O₂ there are 2 Carbon atoms, 4 Hydrogen atoms and 2 Oxygen atoms.
C.) iron oxide <span>is responsible for the red color of Mars.
Hope this helps!</span>
2.91 is the amount of atoms
The mass in a chemical reaction remains (mostly) the same.
(except for radiation/nuclear fission, in which mass gets converted into energy)
