Final answer:
The density of carbon dioxide gas is 0.0196 g/ml.
Step-by-step explanation:
The density of a substance is calculated by dividing the mass of the substance by its volume. In this case, the mass of the carbon dioxide gas is given as 0.196 g and the volume is given as 10 ml.
To calculate the density, divide the mass by the volume:
Density = Mass/Volume = 0.196 g/10 ml
Simplifying this gives you a density of 0.0196 g/ml.
Therefore, the correct answer is option a) 0.0196 g/ml.