Carbontetrachloride, CCl4, was formerly used as a dry cleaning agent. It is pretty nasty stuff, in that it is easily absorbed through the skin and can damage your liver. What is the mass percent of Cl in CCl4

92.2%

Explanation:

Mass percent of Cl in CCl4= Cl/CCl4 ×100

= 35.5/[12+(35.5×2)] ×100 = 0.922×100= 92%

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

level 4 to level 2 : ))