how could I figure out how many grams of pure lemon juice (squeezed from lemons) are in 100 ml?

http://www.convertunits.com/from/milliliters/to/grams

But that link is for water. Lemon juice has a different density than water.

about 3 lemons would do it

To figure out how many grams of pure lemon juice are in 100 ml, you would need to know the density or specific gravity of lemon juice. The density of lemon juice can vary depending on factors such as the ripeness of the fruit and the specific variety of lemon used.

However, as a general estimation, the density of lemon juice is approximately 1.03 grams per milliliter. So, you can use this value to calculate the answer.

To calculate the grams of lemon juice in 100 ml, you can use the following formula:

Grams = Milliliters × Density

In this case, substituting the values, it would be:

Grams = 100 ml × 1.03 g/ml

Therefore, 100 ml of pure lemon juice would weigh approximately 103 grams.