Guide
1
Remember the general form of the equation that you need to calculate the density at a given temperature and pressure.The standard form of the equation of Clapeyron-Mendeleev for the ideal gas law as follows: p * V = R * T.Accordingly, the left side is the product of gas pressure on its molar volume, and the right - the universal gas constant temperature.
2
Note dimension: T - is the absolute temperature, measured in degrees Kelvin.Also, note the value of the gas constant.For the most simple chemical problems enough to know her rounded value: 8.3 J / mol * K.If you forget this value, you can use the formula to calculate the product of the gas constant constant Bolzano, which expresses th
e relationship between temperature and energy (value of 1.38 J / K) on the Avogadro number (6.022 * 10 to 23 degree 1 / mol).The latter contains information on the number of specified structural units (different particles), which fall to 1 mol of substance.
3
Use the formula to find the value of the molar volume of gas required.The resulting value will allow you to find the desired density.To do this, write down the expression of the density by the ratio of the molar mass of the gas to its volume, which is a simple consequence of the definition of density as the ratio of the mass of the body to a certain volume occupied by them.If we are talking about substances that are meant bodies consisting of these substances.The molar mass is determined by the special tables.If you are dealing with a complex matter, determine its molar mass through the summation of the molar masses of its constituent materials.Another way to carry out this operation - to use the molar mass calculator on the Internet.