Does the cracks are allowed in blinding concrete or not (base on ACI code).?

It is law of conservation of mass. The amount of substance reacting should be equal to the amount of product formed. Here, 2Al+3Cl2?2AlCl3 Since Al ion is repreatnted as Al+3& chlorine ion is Cl- In order to balance the 3 +be charge on Al 3 Cl- ions are required.

But Cl only exits as a molecule I. E Cl2 Hence balancing the number of atoms reacting on both sides gives you the balanced equation.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.