sorry can you explain what the correct solution is. Do you need to know how much the density of alcohol is rel. water? Also water and alcohol volumes don't add as far as I remember, so you need to account that that too?

Yes, you need to know the densities, but the models outputted the correct densities even as part of the wrong answer.

Not sure what you mean by volumes "not adding". One way to calculate it is like:

    density_alcohol = 0.789g/ml
    density_water = 1g/ml
    weight_total = 16g
    (density = weight / volume)
    
    volume_alcohol = 0.4 * volume_total
    volume_water = 0.6 * volume_total
    
    weight_total = weight_alcohol + weight_water
    
    weight_alcohol =
      density_alcohol * volume_alcohol =
      0.789 * volume_alcohol =
      0.789 * (0.4 * volume_total) =
      0.3156 * volume_total
    
    weight_water =
      density_water * volume_water =
      volume_water =
      0.6 * volume_total
    
    weight_total =
      0.3156 * volume_total + 0.6 * volume_total =
      0.9156 * volume_total
    
    volume_total =
      weight_total / 0.9156 = 
      16 / 0.9156 =
      17.4749 (rounded)
    
    volume_alcohol =
      0.4 * volume_total =
      6.99 ml (rounded)

Not sure which school grade problems like this are taught in, but I remember similar ones from waaay back. This particular one is a real world problem caused by having a kitchen scale but not a measuring cup, and me wrongly assuming that just asking ChatGPT would help. (ChatGPT 4 from about 2 months ago)

https://www.flinnsci.com/api/library/Download/bc2d91b9d50f4e... I don't really know what ABV even means when the total volume of a mixture is not the sum of the alcohol volume and the water volume. I think practically it means your calculation is slight overestimation?

Oh, I had no idea! I didn't account for that (or a bunch of other things like temperature). So yeah, might be a bit off, but not as much as the wrong initial answers from the LLM - which also failed to mention this.

Math and Science questions in general chat bots seem to struggle with.

I've asked the chat bot that Microsoft Bing uses (not sure what brand or version it is) Chemistry questions - In the format "Is the reaction between X and Y Exothermic under Z Conditions."

It will give a confident answer including things like chemical equations and citations that is blatantly wrong.