CaO ( calcium oxide) is a basic oxide.
Answer:
H2O = (1×2) + ( 1×16)
2+ 16
= 18
<u>22.9</u>
18
1.27
I don't know this answer is right or wrong.
so please ask it from your another friend.
Volume of the solution =
= 2 L solution x 
Volume of solute = 7.5 mL
Volume of water (solvent) = 2000 mL - 7.5 mL = 1992.5 mL water