Technical data

Determination of molar mass using the ideal gas law

Article no: P3010401

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

Principle

All gases may be considered, to a first approximation, to obey the ideal gas equation which relates the pressure p, volume V, temperature T and amount of substance n of a gas. The amount of gas n is expressed as the number of moles and is equal to m / M where m is the mass of gas present and M is the mass of one mole of the gas. The volume occupied by a known mass of gas is to be measured at a given temperature and pressure, so that the ideal gas equation can be used to estimate the molar mass of the gas.

Benefits

Examination of many different gases possible
Illustrative experimental setup

Tasks

Determine the molar masses of the gases helium, nitrogen, carbon dioxide and methane.

Learning objectives

Molar mass and relative molar mass
Properties of gases
Ideal and ordinary gases
Equations of state

Necessary accessories

Precision balance 620g/0.001g

Scope of delivery

Tripod base, for 1 rod	02002-55	2
Stand rods, stainless steel, various sizes	02031-00	2
Stand rods, stainless steel, various sizes	02033-00	1
Universal clamp	37715-01	4
Right angle boss-head clamp	37697-00	7
Gas-syringe holder with stop	02058-00	1
Gas syringe, 100 ml, with 3-way cock	02617-00	1
Glass sphere, 2 stopcocks, 100 ml	36810-00	1
Secure bottle, 500 ml, 2 x Gl 18/8, 1 x 25/12	34170-01	1
Spring manometer, 0...-1000 mbar	34170-02	1
Glass tubes, right-angled, 150 x 80 mm	MAU-10022500	1
Stopcock,3-way,t-shaped, glass	36731-00	1
Rotary valve vacuum pump, two stages, 115 V / 230 V	02741-95	1
Adapter for vacuum pump	02657-00	1
Rubber hose for vacuum, various diameters	39286-00	3
Rubber hose for vacuum, various diameters	39288-00	1
Hose clip, diam. 8-16 mm, 1 pc.	40996-02	4
Hose clip f.12-20 diameter tube	40995-00	2
Weather monitor with big display	87997-10	1
Silicon grease Molykote, 50 g	31863-05	1
Fine control valve	33499-00	1
Compressed gas, nitrogen, 12 l	41772-04	1
Compressed gas, CO2, 22 g	41772-06	1
Compressed gas, methane, 12 l	41772-08	1
Compressed gas, helium, 12 l	41772-03	1