Final answer:
The density of the red liquid is 1g/ml.
Step-by-step explanation:
The density of a substance is determined by dividing its mass by its volume. In this case, the red liquid has a mass of 2g and a volume of 2ml.
To find the density, you divide the mass by the volume:
Density = Mass/Volume
Density = 2g/2ml
Density = 1g/ml
Therefore, the density of the red liquid is 1g/ml.