The beginning of the picture, from the word 'Acrylonitril' to the word 'structuurformule:', means the following: Acrylonitrle reacts with 1,4-butanediamine. When you use a lot of acrylonitril, under certain circumstances you almost exclusively get the following: Then you can see the first of the 2 structural formulas. The text between the 2 structural formulas, says This 'bond' can react with hydrogen. You'll get addition. When this addition finished, you get a bond with the following structural formula: And then you see the picture. The final blob of text: We can make polymere molecules which keep branching on and on because of reactions with hydrogen and acrylonitril. The final question is: * We start with 1 molecule of 1,4-butanediamine. Explain how many molecules of hydrogen are needed to make a polymere molecule with 16 $NH_2$ groups, assume that all reactions are complete.
The answer should be 56, but I have no clue why, can someone explain? I have half of 56, I just did 14x2, because you get 2 $H_2$ molecules per added Acrylonitril, and you have to get 14 Acrylonitril molecules to get to 16 $NH_2$ groups, so that would equal 2x14=28