A. LÍ THUYẾT Câu 1: Thế nào là alcohol, phenol, andehit và axit cacboxylic. Viết CTTQ và nắm phương pháp gọi tên các hợp chất này? Xác định bậc alcohol Câu 2: Nắm vững tính chất Vật lí, tính chất hóa h...

To solve the problem, we can use the given information that 1 alcohol unit is equivalent to 10 mL (or 7.89 g) of pure ethanol. According to the health recommendation, an adult should not consume more than 2 alcohol units per day. We need to find out how many milliliters of 40% alcohol a grown-up should not exceed in a day. We can start by converting the given limit of alcohol units into milliliters. Let's denote the maximum amount of alcohol in milliliters as x. Then, we can set up the equation: \[2 \text{ units} \times 10 \text{ mL/unit} = x\] Solving for x gives us: \[x = 20 \text{ mL}\] So, a grown-up should not consume more than 20 mL of pure ethanol per day. However, since the given question asks about consuming 40% alcohol, we need to adjust our answer accordingly. To find out how much 40% alcohol a grown-up should not exceed in a day, we can use the concept that: \[40\% \text{ alcohol} = \frac{40}{100} \times x\] \[=0.4x\] Substituting x with its value: \[0.4 \times 20 =8\] Therefore, a grown-up should not consume more than \(8\) mL of \(40\%\) alcohol per day. Hence, the final answer is: The limit for consuming alcohol per day is \(8\) mL.