Instruction

1

Mass with the volume between them are closely interrelated. When you consider the various tasks, you can see that the amount can be found in several ways, knowing the mass. Moreover, the tasks typically concern two Sciences - physics and chemistry.The easiest way of finding the volume is its expression in terms of density. It is known that density equals mass divided by volume:ρ = m/V. Accordingly, the volume is:V = m/ρ.The weight of the two substances may be identical. However, if these substances are different, such as copper and iron, the volume will be different because their densities vary.

2

In chemistry there is a model of an ideal gas 1 mole of constant molar volume V = 22,4 mol/L. the gas has a volume at constant pressure and temperature. Molar volume considered mainly from the standpoint of chemistry. from a physical point of view, the volume may change. However, there is a correlation of molar volume and volume some portion of the gas:Vм = V/PV, where V m is the molar volume; V - volume of gas; n - amount of substance.Amount of substance equal to:PV = mV/MV, where mV is the mass of the substance, MV is the molar mass of the substance.Accordingly, the volume portion of the gas is:V = Vм*mV/MV

3

If the task given concentration of a substance and its mass, the volume can easily Express the formula:c = n/V = m/M/V. MV = m/c where M is the molar mass of the substance.Hence the volume is calculated according to the formula:V = m/Mc = n/V where n is the amount of substance.

4

If the problem you are given an ideal gas with a certain pressure p, temperature T and amount of substance n, we can apply the equation Mendeleev-Clapeyron, which will allow us to Express the volume:pV = mRT/M, where R is the universal gas constant.Accordingly, based on the equation, looking for the volume V = mRT/Mp.This equation is only suitable look for those gases whose parameters are close to ideal.