What is the density of carbon dioxide gas if 0.196g occupies a volume of 100ml?

We know that the equation for density is:

where D is the density, m is the mass in grams, and V is the volume.

Given two of the variables, we can then solve for density:

So therefore, we now know that the density of carbon dioxide gas is 0.00196g/mL.

what is the volume occupied by 40 grams of argon gas (ar) at standard conditions? what volume, in liters, is occupied by 1.5 x 1023 

im not exactly sure but i think its b!