How much caffeine is there in a chocolate bar?

It's impossible to give you an exact caffeine amount for a "chocolate bar" without knowing more details. Here's why:

* Chocolate Variety: The type of chocolate significantly impacts caffeine content. Dark chocolate generally has the highest caffeine, followed by milk chocolate, and then white chocolate (which usually contains no caffeine).

* Cocoa Percentage: The higher the cocoa percentage in dark chocolate, the more caffeine it will contain.

* Size & Brand: The size and specific brand of the chocolate bar will also affect the total caffeine.

Here's a general idea:

* Dark chocolate (70% cocoa or higher): Can contain around 20-50mg of caffeine per ounce.

* Milk chocolate: Typically has much less caffeine than dark chocolate, usually around 5-10mg per ounce.

* White chocolate: Usually contains no caffeine.

If you're concerned about caffeine intake, it's best to check the nutrition label on your specific chocolate bar.