A small generic section of the primary structure of an α helix is given by − amino acid 1 − amino acid 2 − amino acid 3 − amino acid 4 − amino acid 5 − amino acid 6 − amino acid 7 − −amino acid1−amino acid2−amino acid3−amino acid4−amino acid5−amino acid6−amino acid7− Which amino acid residue's backbone forms a hydrogen bond with the backbone of the first ( 1 st ) (1st) residue

what's the

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%

it's filtration, but this is an assumption so my apologies if i got this

b is the correct answer

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