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As the volume of a given gas sample is dependent on its temperature and pressure; to find a volume of any gas which does exist, the temperature and the pressure of the system/vessel should be given directly or could be calculated.
You cannot. If you are given the density, the volume of the object, and the area over which the object rests, then it is possible to find the pressure. If density is "d", volume is "v", and area is "a" then pressure p = (d x v x g)/a where g is the acceleration due to gravity.
Pressures simply add. If the partial pressure of gas is three and the partial pressure of water is five, the total pressure is eight. Find the partial pressure for water at the temperature of your experiment, subtract it from your pressure reading. As an aside, if you've corked your glassware rather than using a slider or a water bath, expect stupid results.
Utilize Henry's Law: S1P1=S2P2
To convert Torr to mm Hg, divide by 1.33. So, the partial pressure of helium in mm Hg is 439 Torr / 1.33 = 330 mm Hg. To find the partial pressure of hydrogen, subtract the partial pressure of helium from the total pressure: 600 mm Hg - 330 mm Hg = 270 mm Hg. Hence, the partial pressure of hydrogen gas is 270 mm Hg.
Volume = pi*r2*h
Volume = mass / density
By comparing the volume given to each figure.
Multiply them: density*volume = mass
When taken the first pressure and the first volume, you try to find out what the second volume is given the second pressure. So, taking that into consideration, you multiply the first pressure (0.071) with the first volume (0.5 mL) and divide it by the second pressure (0.092) which gives you the answer of 0.39 mL (SF) Keep in mind that pressure and volume are inversely proportional.
If you mean as in a rectangular cuboid then divide the product of the two given sides into the volume to find the height.
The vapor pressure and density of a given material is found in the physical section of the MSDS. Density is calculated by dividing mass by volume.