Lewis Structure + Molecular Mass Practice

Question 1

How can you easily tell how many bonds an element likes to form when needing to draw a lewis structure?

Answer 1

the charge for the group that it is in usually corresponds to how many bonds an elements will form (ex: Hydrogen = +1 = forms 1 bond; O = -2 = forms 2 bonds)

Question 2

Describe how you would go about drawing a lewis structure

Answer 2

• Identify the total number of valence electrons for the compound
• Place the least electronegative atom in the center
• Draw at least one line to each atom (one line = 2 vale-)
• Find out how many remaining vale- you are working with
• Place that number of vale- randomly around the atoms
• move atoms as needed (ex: form double bonds) so that each atom has 8 valence electrons

Question 3

Draw Lewis Structure

CH₄

Answer 3

check online for answers lol

Question 4

Draw lewis structure

SF₂

Answer 4

check online lol

Question 5

Draw lewis structure

CO

Answer 5

check lab pg.66

Question 6

Draw lewis structure

SO₂

Answer 6

check lab pg 66

Question 7

What is the molar mass of Al(OH)₃

Answer 7

78.0g

Question 8

What is the molar mass of Magnesium Sulfate

Answer 8

120.4g

Question 9

What is the molar mass for Fe₂O₃

Answer 9

159.6g