What mass (in g) of aluminum can be electroplated when 0.834 amps are used for 1.175 hours using a solution of aluminum nitrate?

Explanation:

The given chemical reaction will be as follows.

Also, mass deposited can be calculated using the formula as follows.

               W = Zit

where,     W = weight or mass of the substance

                Z = electrochemical equivalent

                 i = current

                 t = time in seconds

Calculate value of Z for the given reaction as follows.

               Z =  

             molar mass of Al = 26.98 g/mol

                 Z =  

                    = g/mol

Therefore, putting the given values into the above formula as follows.

                    W = Zit

                         =

                          = 0.328 g

Thus, we ca conclude that 0.328 g of aluminium can be electroplated in the given situation.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.