you do some multiplication
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Density = Mass/Volume, correct. However, with a cylinder, you have to find the volume. In order to find the volume of a cylinder use the equation PiR2 * H where "R" is the radius (Diameter/2) squared.
That all depends on the type of gas and volume given for the problem. We can't determine the mass and density of the gas cylinder if we are not given these info, which can also include pressure (because density varies based on that variable).
Yes, provided you know the density of the substance and the substance can be adequately measured by the cylinder. Because density is the quotient of the mass and volume, the mass is the product of the density and volume. So if you multiply the density and volume (assuming the units match), you will find the mass.
The density of an any material/object is given by p=m/V The volume of a cylinder is V= πr2h So the density of a cylinder is therefore: p=m/πr2h Where: m is mass, r is radius and h is the height of the cylinder.
Find the density and mass of the object d=m/v and plug in your numbers and solve for volume