For an adult weighing 139.2 lb, the lethal dose of Isotretinoin corresponds to how many whole Acutane pillsLD50 = 11900 mg/kg Each Vitamin C tablet is 49% (m/m) ascorbic acid 1 Vitamin C tablet weighs 1.102 g

To calculate the number of Acutane (Isotretinoin) pills that would correspond to a lethal dose for an adult weighing 139.2 lb, we can follow these steps. The lethal dose, \( \text{LD}_{50} \), is provided as 11900 mg/kg, which means it represents the dose that would kill 50% of the subjects at that mass.

### Step 1: Convert the weight from pounds to kilograms.
To convert pounds to kilograms:
\[
\text{Weight (kg)} = \frac{139.2 \, \text{lb}}{2.20462 \, \text{lb/kg}} = 63.12 \, \text{kg}
\]

### Step 2: Calculate the lethal dose for this weight.
Using the LD50 value of 11900 mg/kg, we calculate the total lethal dose:
\[
\text{Lethal dose} = 11900 \, \text{mg/kg} \times 63.12 \, \text{kg} = 751128 \, \text{mg} = 751.13 \, \text{g}
\]

### Step 3: Determine how many Acutane pills correspond to this lethal dose.
We need to know the dosage of isotretinoin per Acutane pill. If we assume a typical Acutane pill contains 40 mg of isotretinoin (a common prescription dose), the number of pills would be:
\[
\text{Number of pills} = \frac{751128 \, \text{mg}}{40 \, \text{mg/pill}} = 18778.2 \, \text{pills}
\]
Since the number must be a whole number, the lethal dose corresponds to 18,778 Acutane pills.

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If the question regarding Vitamin C tablets relates to isotretinoin, please clarify further, as it seems unrelated to the isotretinoin calculation. Would you like me to explore this further or adjust the calculations? Let me know if you need more details!

### Related Questions:
1. What are the risks associated with isotretinoin overdose in lower doses?
2. How does the LD50 vary for different substances in humans?
3. What other factors can influence the toxicity of isotretinoin?
4. How is isotretinoin metabolized in the body?
5. What is the typical prescribed dose of Acutane, and how does it compare to lethal doses?

#### Tip: Always check the exact dosage of medications, as they can vary significantly across brands or formulations.

For an adult weighing 139.2 lb, the lethal dose of Isotretinoin corresponds to how many whole Acutane pills. LD50 = 11900 mg/kg. Each Vitamin C tablet is 49% (m/m) ascorbic acid. 1 Vitamin C tablet weighs 1.102 g.

Learn how to calculate the lethal dose of Isotretinoin (Acutane) for an adult weighing 139.2 lb using unit conversion and proportional reasoning. This detailed step-by-step guide shows how to apply the LD50 formula and convert the result into the number of Acutane pills. Suitable for high school students in Grades 10-12.

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