Answer:
C:
Explanation:
Current flows from negative to positive.So the electrons will be moving left.
when a current is applied, positive charged copper ions (called cations) leave the anode (positive electrode) and move to the cathode (negative electrode).
Answer: The formula of the hydrated alumina is 
Explanation:
Decomposition of hydrated alumina is given by:

Molar mass of
= 101.96 g/mol
According to stoichiometry:
(101.96+18x) g of
decomposes to give 101.96 g of
Thus 5.000 g of
decomposes to give=
of H_2O
But it is given 5.000 g of a sample of hydrated salt
was found to contain 2.6763 g of unhydrated salt
Thus we can equate the two equations:


Thus the formula of the hydrated alumina is 
In the following compound of sucrose the atoms are as follows:
Carbon - 12 atoms
Hydrogen - 22 atoms
Oxygen - 11 atoms.