Draw lewis structures for each of the following moecules. show resonance structures, if they exist
a) o2
b) n2
c)co
d)so2
draw lewis structures for each of the fllowing polyatomic ions. show resonanace structures, if they exist.
a)oh-
b)h3c2o2-
c)bro3-
determine the type of hybrid orbitals form by the boron atom in a molecule of boron fluoride, bf3.

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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%