Depends on the brand - but for Bakers 1 square = 1 ounce.
5oz = 142g
There is no square relevant to tablespoons.
Baking chocolate squares are about 1 ounce of chocolate (although some may be smaller 1/2 ounce squares). You can use a food scale to measure out the corresponding amount of chocolate chips - ie 4 ounces of chips for 4 squares. If you don't have a scale I've found that this usually works out to about 3/4 cup of chocolate chips.
4.5 oz
16 ounces
86 semi-sweet chocolate chips equals 3 squares of semi-sweet baking chocolate.
you will need 16 squares or 2 cups
6 ounces of chocolate chips = 1/3 cup = 1 baking chocolate square
There are 2 tablespoons in 1 ounce of shredded baking chocolate. Therefore, for 2 ounces, you would have 4 tablespoons. So, 2 ounces of shredded baking chocolate equals 4 tablespoons.
If you mean 1 oz squares (ie Baker's), 12 ounces would equal one 12-ounce bag of chips, or about two cups. Nestle's is making baking squares that are only half an ounce, so 12 of those would be 6 ounces of chips, or about one cup.
12 ounces of Chocolate Chips equal 12 squares of baking chocolate.
2 oz of unsweetened chocolate is equivalent to about 1/4 cup when melted.