How many grams to 225 ml?

Answer 1

This question cannot be answered sensibly. A millilitre is a measure of volume, with dimensions [L3]. A gram is a measure of mass, with dimensions [M]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.

A simple mental exercise will demonstrate that a millilitre of air and a millilitre of water will have very different masses.

Answer 2

This is not a proper 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.