If 16.8 g of substance XY contains 3.4 g of X, what is the mass percentage of Y?

79.76%

Explanation:

16.8g of XY

3.4g of X

% of Y

mass of Y= 16.8-3.4

=13.4g

mass %= 13.4/16.8×100

mass % of Y=79.76%

Explanation:

Sacrificial protection is a corrosion protection method in which a more electrochemically active metal is electrically attached to a less active metal. The highly active metal donates electrons to replace those which may have been lost during oxidation of the protected metal.

Electroplating is a general name for processes that create a metal coating on a solid substrate through the reduction of cations of that metal by means of a direct electric current. The part to be coated acts as the cathode (negative electrode) of an electrolytic cell; the electrolyte is a solution of a salt of the metal to be coated; and the anode (positive electrode) is usually either a block of that metal, or of some inert conductive material. The current is provided by an external power supply.