Most are made with yeast, so they don't contain any baking powder.
The amount of baking powder required depends entirely on what you intend to bake. Different types of cookies, muffins and other baked goods require different proportions of baking powder to flour.
Generally you use 1 to 2 teaspoons of baking powder to each cup of flour.
I don't know how much volume 4 oz. will be, but most recipes use the ratio of 1 teaspoon of baking powder to 1 cup of flour. Weigh the flour, measure it and find the amount of baking powder that way.
Most recipes use 1 teaspoon of baking powder to 1 cup of flour.
I personally would never use baking soda or baking soda as a substitute for flour because they have different uses. Plus, that much baking soda or baking powder and no flour would leave a horrible taste in your mouth. Baking soda and baking powder are only used to make food rise while cooking and only a small amount of each is needed. While flour is more for adding density and flavour. If you're looking for a substitute for regular wheat flour, I would suggest oat flour, corn flour or soy flour.
About one teaspoon of baking powder to 1 cup of all purpose flour
Baking powder is a 1:3 ratio of baking soda to cream of tartar. You cannot just substitute cream of tartar for baking powder - you also need the baking soda.
You can but you need to add baking powder and salt to it.
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For 10 pounds of flour, you typically need about 1 to 1.5 tablespoons of baking powder per cup of flour. Since there are 16 cups in a pound, 10 pounds of flour equals 160 cups. Therefore, you would need approximately 10 to 15 tablespoons of baking powder for 10 pounds of flour, depending on the desired leavening effect.
There is not a standard amount - it varies according to what you are cooking. If you wish to turn plain flour into self-raising, you need baking powder (which is a 1:3 ratio of bicarbonate of soda to cream of tartar). You need one teaspoon of baking powder to a cup of plain flour to create self-raising flour.
To make self rising flour .......1 cup flour add 1 teaspoon baking powder, 1/2 teaspoon salt and 1/4 teaspoon baking soda