How many ml is 130 mg of ibuprofen?

This is not a valid conversion. Milliliters (mL or ml) and liters (L) are measures of volume. Grams (g), kilograms (kg) and milligrams (mg) are measures of weight or mass. You can convert (using complex formulas), though i really don't see the need of knowing the dosage in milliliters unless you are melting it.

In order to tell how many ml of liquid ibuprofen, you must know how many mg is in each ml - once you provide that number, we can calculate the number you need.