To find hydrogen density, determine its weight in this volume and find the relation of these sizes. As it is difficult to find the mass of gas, it is possible to use Klapeyrona-Mendeleyev's equation, for this purpose it is necessary to know temperature and pressure under which there is a hydrogen. If the average square velocity of the molecules of hydrogen is known to time at present, its density can be learned from the main equation of the molecular and kinetic theory. It can be measured by the densitometer directly.
It is required to you
- tight cylinder, scales, manometer, thermometer, densitometer.
Instruction
1. Direct calculation of density you vodorodavozmit a tight cylinder with the known volume and by means of the pump pump out from it air, having received a vacuum. Weigh it on scales. After that fill it with hydrogen and again weigh. The difference between the mass of the empty and filled cylinder will also make the mass of hydrogen. You take measurement of weight in grams, and volume in cm³.Для of obtaining value of density divide the mass of hydrogen into its volume ρ=m/V. Receive result in g/cm³.
2. Determination of density of hydrogen at the unknown of a masseesla is not present an opportunity to measure the mass of hydrogen, measure its pressure in this vessel by means of the manometer in pascals. The thermometer take its temperature. If hydrogen is beefy in a cylinder, just wait until its temperature is equal to room. As at the vast majority of thermometers the scale is graduated in degrees Celsius, transfer it to kelvins, having added to value of temperature 273. For obtaining density of hydrogen under existing conditions, increase pressure by 0.002 (the molar mass of hydrogen expressed in kilograms on mol). Consistently divide the received result into 8.31 (a universal gas constant) and value of temperature ρ=P•M/(R•T). The result will be received in kg/m³.
3. Determination of density of hydrogen the average square velocity of the molecules of hydrogen which depends on their kinetic energy is known for average square velocity of the molecules If, so, temperatures, measure by the manometer its pressure, and, having increased its value by 3, divide into a square of average square speed ρ=3•P/v² (from the main equation of MKT). Measure pressure in pascals, and speed in meters per second.
4. Measurement of density you vodorodazapolnit the sensor of the vibration densitometer hydrogen then turn on the device. On its screen it will be possible to see density of this gas.