Answer:
The answer is B an open system allows energy and mass to move in and out of it
Hope it helps
A chemical formula identifies each constituent element by its chemical symbol and indicates the proportionate number of atoms of each element.
<em>For example, the empirical formula of ethanol may be written C2H6O because the molecules of ethanol all contain two carbon atoms, six hydrogen atoms, and one oxygen atom.</em>
Electrons can be transformed from on object to another , (can you mark me brainlyest)
