Answer:
2g/ ml.
Explanation:
Density is measured as units of mass/volume and its often g/ml. The density of a sample is the mass over the volume. i.e It is calculated by the dividing the mass by the volume.
Since we already know the formula for density;
d = MASS / VOLUME (where mass is 12g and volume is 6ml)
d = 12g / 6ml
d = 2g /mL.