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Preheat oven to 350 degrees F (175 degrees C).
Place chicken in a roasting pan, and season generously inside and out with salt and pepper. Sprinkle inside and out with onion powder. Place 3 tablespoons margarine in the chicken cavity. Arrange dollops of the remaining margarine around the chicken's exterior. Cut the celery into 3 or 4 pieces, and place in the chicken cavity.
Bake uncovered 1 hour and 15 minutes in the preheated oven, to a minimum internal temperature of 180 degrees F (82 degrees C). Remove from heat, and baste with melted margarine and drippings. Cover with aluminum foil, and allow to rest about 30 minutes before serving.