Lewis Structures

[Cafegurl]

Here's one of my problems:
1. Draw the Lewis structures for the following molecules or polyatomic ions:

a.) NH3

b.) SiO2

c.) OH-1

how do you do this?
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problem 2:

Find the Hybridizations, shapes, and expected bond angles of the central atoms in the following molecules:

a.) SiO2

b.) CH2O

c.) OF2

how do you do these problems?
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Problem 3:

how do you find Molar Mass?

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Problem 4:
Find the molar mass of the following compounds:

a.) Na2SO4

b.) nitrogen trichloride

c.) fluorine

i am new at chemistry so this is all a blur, i need step by step answers!


from:
The Confused :roll: