The equation for the molar gas constant, what is the molar constant of the gas

The full name of the gaseous equation is the ideal gas equation of state, which generally refers to the Claperosaurus equation: PV=NRT. where p is the pressure, v is the volume, n is the amount of matter, r is the universal gas constant, and t is the absolute temperature (t is in Kelvin (the letter is k), and the value is the temperature in Celsius, such as 0.

When the units of p, v, n, and t are kpa (kilopascals), m3 (cubic meters), dm3 (cubic decimeters), mol, k (kelvin), and r are respectively. Strictly speaking, this equation only applies to ideal gases, but approximate can be used for real gases (including room temperature and pressure) in non-extreme cases (low temperature or high pressure).

Boyle-Maryoll's law: In an isothermal process, the pressure of a certain mass of gas is inversely proportional to its volume. That is, the product of pressure and volume in either state is a constant when the temperature is constant. That is, p1v1=p2v2.

Guy Lussac's law: For every increase (decrease) increase (decrease) in the temperature of a gas of a certain mass under constant pressure1, its volume increases (decreases) by an amount equal to 1 273 of the volume at 0.

Charlie's law states that the pressure of a gas of a certain mass, when its volume is constant, is proportional to its thermodynamic temperature. Namely.

P1 P2=T1 T2 or P=P 0(1+t 273).

where p 0 is the pressure of the gas when 0 is 0 and t is the temperature in Celsius.

Combining the above three laws, we can obtain a constant quantity of PV t=, which is proportional to the amount of matter of the gas, and the Claperosaurus equation is obtained.

Gas molar constantis j (mol k),The unit is pronounced "Jiao every Mo every open". What they say is called the standard condition.

Lower ideal gas molar volume.

The unit of dm3 mol is read as "cubic decimeter per mo", of course because of the equation of state of an ideal gas.

The units of each variable in PV=NRT (also known as the Clapeyron equation) can be written in many ways.

Molar constant calculation:n=n/na。

n=m/m。

pv=nrt。

PV = NRT with the same temperature, same pressure and same volume, and the same number of molecules, that is, the number of moles of gas.

Like in the same standard case, the molar volume of the gas is about.

Calculate the molar volume under the standard condition: v=, n is the amount of gaseous substance.

Then, according to the specific temperature and pressure conditions, the ideal gas equation of state pv=nrt is used, p is the pressure, v is the volume, n is the amount of matter, and r is the ideal gas constant.

t is the temperature (k).

Molar gas constant, also known as:Universal gas constant, the ideal gas constant and the universal gas constant, the symbol is r, which is a state of matterEquationsThe physical constants that connect the thermodynamic functions in .

Ideal gas constantBecause all real gases approach the ideal gas when the pressure approaches zero, it is experimentally determined that when the temperature is, the value of any gas per mole is, therefore, in the legal unit of measurement r=.

The principle of determination of the molar gas constant

Magnesium strips of known mass are used to react with excess acid to produce hydrogen. The volume of the hydrogen, the temperature and pressure at the time of the experiment are substituted into the equation of state of the ideal gas.

pv=nrt), the value of the molar gas constant r can be calculated. Hydrogen is mixed with water vapor.

According to the law of partial pressure.

The partial pressure of hydrogen (p(h2)=p(total)-p(h2o)) can be obtained, and the p(h2o) values at different temperatures can be obtained in the table.

The above content refers to the Encyclopedia - Molar Gas Constant.

1. Experimental principle.

The displacement method was used to replace the elemental magnesium of known accurate mass with excess dilute sulfuric acid at a certain pressure and temperature.

H2 is obtained, and the amount of the substance of H2 is obtained by calculation.

The volume of H2 produced by the Lujing reaction was determined by the drainage method, and the equation of state of the ideal gas was substituted into the water method.

to get the r-value.

2. Experimental preparation.

1 Make a note of the room temperature and atmospheric pressure.

The saturated water vapor pressure at room temperature is detected.

2.Assemble the instrument.

3 Open the plug of the measuring tube, fill the measuring tube with water from the funnel to a position slightly lower than the scale, move the funnel up and down to remove the air bubbles attached to the inner wall of the hose and the measuring tube, and then plug the plug of the test tube tightly.

4. Check the air tightness of the device.

5 Polishing the magnesium strips with sandpaper to wipe off the oxide film on the surface of the magnesium strips.

3. Experimental content.

4. Experimental data recording and processing.

5. Experimental guidance and precautions.