Final answer:
The front of the upper leg represents about 4.5% of the body's surface area. Thus, the woman who spilled ammonia on her leg has approximately 4.5% of her body burned. Ammonia, a chemical used in cleaning products, can cause chemical burns.
Step-by-step explanation:
The question is asking about the percentage of body surface area that has been affected by a chemical burn due to an ammonia spill. To estimate the affected body surface area, medical professionals use a guideline known as the Rule of Nines, which divides the body into sections that are approximately 9% of the body surface area each. The front of the upper leg, according to this rule, would be considered as 9% for each leg or 4.5% per leg if only considering the front or the back. Since it is only the front of one upper leg that has been burned, approximately 4.5% of her body is burned.
Ammonia, which is a compound made up of nitrogen and hydrogen (NH3), can cause chemical burns upon contact with skin, necessitating caution while handling.
Warning: Chemical burns can be severe, highlighting the importance of safety when working with chemicals such as household cleaners that contain ammonia.