Quick Answer
Baking Powder does not use the same grams-to-cups value as every other ingredient. Using a practical US cup reference, 230 grams of baking powder is about 1 cup.
That means 100 grams of baking powder is about 0.43 cups, while 200 grams is about 0.87 cups.
Baking powder is a leavening agent used in small amounts. The per-cup weight is given for reference, but recipes typically call for teaspoons.