Both amines and amides are derivatives of ammonia. true false

It is true that both amides and amine are the derivatives of ammonia.

Amines are the derivatives of ammonia where nitrogen atom makes bond to 1, 2, or 3 alkyl or aromatic groups of compounds. Amides are the amino group , which is derived from ammonia, replaces the hydroxyl group in a carboxylic acid.

The simplest amides are the proper derivation of ammonia whereas the higher degree amides are the derivation of secondary amine.  

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%