Remember the General form of the equation you need to calculate the density at specified temperature and pressure. The standard form of the equation of clayperon-Mendeleev to the ideal gas law as follows: p*V = R*T. Accordingly, the left side is the product of the gas pressure to its molar volume, and the right is the universal gas constant on temperature.
Pay attention to the dimension: T is the absolute temperature measured in Kelvins. Also note the value of the gas constant. For most simple chemical problems is enough to know the rounded value of 8.3 j/Mol*K. if you forget this value, you can use the formula for the calculation of gas constant through the constant work of Bolzano, expressing the relationship between temperature and energy (value is 1.38 j/K) Avogadro's number (6,022 * 10 23 1/mol). The latter contains information about the amount of specified structural units (particles) that fall on 1 mole of the substance.
Use the formula to find out values of molar volume of gas required. The resulting value will allow you to find the required density. To do this, write an expression for the density via the ratio of molar mass of a gas to its volume, which is a simple consequence of the definition of density as the ratio of the mass of a specific solid to occupied volume. If we are talking about substances that are bodies composed of these substances. The molar mass determined by special tables. If you are dealing with a complex substance, determine its molar mass using the summation of molar masses of substances contained in it. Another way to carry out this operation is to use a calculator molar mass on the Internet.