0.75 grams equal how many ml?

Answer 1

That depends on the substance's density:

To convert mass to volume one has to divide mass by the density (with correct units of mass and density)

Example:

• Alcohol, density 0.80 g/mL, gives 0.75 gram a volume of 0.75 (g) / 80 (g/mL) = 0.94 mL

• The same for water: density 1.00 g/mL, gives 0.75 mL for each 0.75 gram

Answer 2

Only if you have pure water in mind: 75 milliliters of pure water weigh 75 grams.

Answer 3

This cannot be sensibly answered. Milliliters (mL or ml) is a measure of volume, grams is a measure of weight or mass.