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.
To make self-raising flour from all-purpose flour, you can add 1 tablespoon of baking powder for every cup of flour. Since 1 cup of all-purpose flour is approximately 4.5 ounces, this translates to about 0.23 ounces of baking powder per ounce of flour. Therefore, for every 4.5 ounces of flour, you'd use approximately 0.5 ounces of baking powder.
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.
For 325 grams of flour, you typically need about 1 to 1.5 teaspoons of baking powder. This is based on the general guideline of using 1 teaspoon of baking powder for every 125 grams of flour. Adjust the amount slightly depending on the recipe or desired leavening effect.
You can but you need to add baking powder and salt to it.
3
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.