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Can someone calculate the density of a body ( not easy)?

i) A density flask is accurately weighed empty and its mass is 60.291g.lt is then carefully filled with oil up to the engraved volume on the flask being 99.98ml. The flask is re-weighed and the total mass is found to be 155.158 g. Calculate the density of the oil.

ii) In order to calculate the density of an irregular (difficult to measure the dimensions for volume) shaped body in the lab, you are given a Balance, a hydrostatic bench, a beaker of fresh water and a box of weights to find the mass of the irregular shaped body in air and also the mass when fully immersed in water You found the mass in air to be 212.5g and when fully submerged in water, the mass was found to be 194.24g Find the density of the body

iii) Evaluate the methods you used to determine the density of a solid material and the density of a liquid in the first two questions and also that of a body that floats in water.

I've done part i but I don't understand the rest. Can someone please help.

1 Answer

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  • Anonymous
    4 years ago

    ii) (212.5 - 194.24) = 18.26g. of water being displaced.

    Water density = 1g/cc., so volume of body = 18.26 cc.

    iii) You might find the mass in air of a body and its mass in water to determine its volume as in (ii). Then you might immerse the body in an unknown liquid, and again find its mass. The fluid density will be the mass in water / mass in unknown liquid.

    If a body floats, you find mass in air, then with a container of water of known mass sitting on a balance or scale, you put the body in the water, you push it down with a fine wire or stick so it it fully immersed. You then note the change in mass of the container.

    The result minus the original mass will give a water mass displaced by the body. With that and its mass in air, you can find density.

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