If the volume is 0.121 CUBIC cm, then the calculated density would be 22.479 grams per cubic cm. This is somewhat lower than the true density (at standard temperature and pressure) of osmium.
It depends on what the subtance is, i.e. whether there is 272g of copper, sodium chloride, lithium hydroxide or what. The way to calculate the amount of a subtance in moles is to divide the mass of the substance (in grams) by the atomic mass, molecular mass or formula mass of the element, molecular compound or ionic compound respectively, as the case may be.
The common octopus weighs 6.6 to 22 lbs, but different species can weight anywhere from 1oz to 150 lbs.
There really isn't an easy way to figure the exact amount of bone in a chicken, because every chicken is a little bit different. However, a general rule of thumb is that when you cut up a whole chicken, there is going to be approximately 40% of the chicken for refuse (that is, portions that cannot be directly eaten). You can use those portions - for example, drumstick bones and rib bones, etc - for chicken stock and flavoring, but they cannot be directly digested. So, by this theory, one pound of bone-in chicken would equal 0.6 pounds (approx. 9.5 oz, or 272g). However, this is not an exact science. And if you are following a recipe that uses bone-in chicken, also keep in mind that bone-in chicken has a longer cooking time, so you will have to adjust your recipe accordingly, otherwise you'll overcook your chicken and it might be tough and dry.