Product details

Hess's law with Cobra4

Hess's law with Cobra4

Item no.: P3021661
While stocks last

Experiment Type: Teacher Experiment, Laboratory Experiment

Difficulty Expenditure of Time print
  • Description
  • Scope of Supply
  • Accessories
  • Downloads and Documents

Principle

The standard molar enthalpies of formation ΔBHΦ are important compiled thermodynamic tabulation quantities for calculating standard enthalpies of reaction for any arbitrary reaction. They are defined as the heat of reaction occurring in the direct formation of one mole of the pertinet pure substance from the stable pure elements at constant pressure. For spontaneous and quantitative formation reactions, e.g. the conversion of carbon and oxygen to CO2, standard enthalpies of formation can be measured directly using calorimetry. Alternativly, they can be calculated from known entahlpies of reaction using Hess's law.

Benefits

  • Simplified implementation: all pre-settings already prepared
  • Glass jacket system easily expandable
  • Stable and safe construction due to solid stand material

Tasks

  1. Determine the enthalpies of reaction for the combustion of carbon and carbon monoxide calometrically.
  2. Use the experimentally determined enthalpies and Hess's law to calculate the enthalpies of formation of CO and CO2.

What you can learn about

  • First law of thermodynamics
  • Thermochemistry
  • Calorimetry
  • Enthalpy of formation
  • Enthalpy of reaction
  • Hess's law

Necessary accessories

  • Precision balance 620g/0.001g

Software included. Computer not provided.

Device Name Item no. Qty
U-tube with lateral connector, GL 25 MAU-27229500 1,00
curricuLAB measureLAB 14580-61 1,00
Barrel base expert 02004-55 1,00
Quartz glass wool 10 g 31773-03 1,00
Magnetic stirring bar 30 mm, cylindrical 46299-02 1,00
Cobra4 Wireless/USB-Link incl. USB cable 12601-10 1,00
Tweezers,straight,blunt, 200 mm 40955-00 1,00
Rubber stopper, d=22/17 mm, without hole 39255-00 1,00
Stopcock,3-way,t-shaped, glass 36731-00 1,00
Magnet, d = 10 mm, l = 200 mm 06311-00 1,00
Funnel, glass, top dia. 50 mm 34457-00 1,00
Charcoal,small pieces 250 30088-30 1,00
Steel cylinder oxygen, 2 l, filled 41778-00 1,00
Protective glasses, green glass 39317-00 1,00
Paper,ceram.fibre,1.0x500x2000mm 38750-01 1,00
Test tube GL25/8, w.hose connec. 36330-15 1,00
Glass jacket 02615-00 1,00
Teclu burner, DIN, natural gas 32171-05 1,00
Techn. magnifier, 10x, d:23mm 64598-00 1,00
Cobra4 Sensor-Unit Chemistry 12630-00 1,00
Hose clip f.12-20 diameter tube 40995-00 2,00
Rub.stop.d=38/31mm,1 hole 15mm 39260-19 1,00
Retort stand, h = 750 mm 37694-00 2,00
Round bottom flask, 100ml, GL 25/12 35841-15 1,00
Support base DEMO 02007-55 1,00
Sulphuric acid, 95-98% 500 ml 30219-50 1,00
Pinchcock, width 15 mm 43631-15 1,00
Wrench for steel cylinders 40322-00 1,00
Test tube holder, up to d 22mm 38823-00 1,00
Graduated vessel, 1 l, with handle 36640-00 1,00
Calorimeter insert for glass jacket 02615-01 1,00
Mortar with pestle, 150 ml, porcelain 32604-00 1,00
Scissors,straight,blunt,l 140mm 64625-00 1,00
Immersion probe NiCr-Ni, teflon, 300 °C 13615-05 2,00
Hose clip, diam. 8-16 mm, 1 pc. 40996-02 4,00
Safety gas tubing, DVGW, sold by metre 39281-10 1,00
Right angle boss-head clamp 37697-00 6,00
Formic acid 75% 250 30023-25 1,00
Funnel for gas generator, 50 ml, GL18 35854-15 1,00
Support rod, stainless steel, l = 250 mm, d = 10 mm 02031-00 2,00
Water, distilled 5 l 31246-81 1,00
Commercial weight, 500 g 44096-50 1,00
Gasometer 1000 ml 40461-00 1,00
Lighter f.natural/liquified gases 38874-00 1,00
Glass tubes,right-angled, 10 36701-59 1,00
Water jet pump, plastic 02728-00 1,00
Reducing valve f.oxygen 33482-00 1,00
Weather monitor, 6 lines LCD 87997-10 1,00
Table stand for 2 l steel cylinders 41774-00 1,00
Rubber tubing, i.d. 6 mm 39282-00 5,00
Universal clamp 37715-00 7,00
Test tube,180x20 mm, PN1 36293-00 1,00
Combustion lance for gases 02613-00 1,00
Glycerol, 250 ml 30084-25 1,00
Document     Filesize
p3021661e.pdf Experiment guide, English 597.8 KB

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