Answer: 27 is A and 28 is C.
Explanation: I’ll explain 28 but not 27 because that’s just definitions.
In CuSO4 there is a Cu, an S, and 4 O molecules. Add them up you get 6.
The pressure of a cloud varies with depth because of volume.
I do not fully know Sorry :( hope someone comes and helps you im not smart in dna and all that
yes substances Do react by mass
Answer:
So, that students like us get confuse!!!
Explanation: