This article requires accessories

Hess's law with Cobra SMARTsense

Item No. P3021667

Pupils , Students
heavy
grades 10-13 , University
30 Minutes
45 Minutes
EUR 5,076.10
Content 1 piece
EUR 6,040.56 Incl. VAT

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.

 

Learning objectives

  • 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.
Quantity
Cobra SMARTsense Thermocouple - Sensor for measuring temperature -200 ... +1200 °C (Bluetooth + USB)
Item No. 12938-01
2
measureLAB, multi-user license
Item No. 14580-61
1
Immersion probe NiCr-Ni, teflon, 300 °C
Item No. 13615-05
2
Retort stand, h = 750 mm
Item No. 37694-00
2
Support base DEMO
Item No. 02007-55
1
Stand rods, stainless steel, various sizes | Length: 250 mm
Item No. 02031-00
2
Barrel base expert
Item No. 02004-00
1
Right angle boss-head clamp
Item No. 37697-00
6
Universal clamp
Item No. 37715-01
7
Glass jacket
Item No. 02615-00
1
Calorimeter insert for glass jacket
Item No. 02615-01
1
Combustion lance for gases
Item No. 02613-00
1
Magnetic stirring bar 30 mm, cylindrical
Item No. 46299-02
1
Magnet, d = 10 mm, l = 200 mm
Item No. 06311-00
1
Techn. magnifier, 10x, d:23mm
Item No. 64598-00
1
Funnels (glass), Boro, various sizes | Top diameter: 50 mm
Item No. 34457-00
1
Graduated beaker, 1000 ml, plastic (PP)
Item No. 36640-00
1
Paper,ceram.fibre,1.0x500x2000mm
Item No. 38750-01
1
Gasometer 1000 ml
Item No. 40461-00
1
Commercial weight, 500 g
Item No. 44096-50
1
Stopcock,3-way,t-shaped, glass
Item No. 36731-00
1
Test tube GL25/8, w.hose connec.
Item No. MAU-27221000
1
Glass tubes,right-angled
Item No. MAU-10030701
1
Pinchcock, width 15 mm
Item No. 43631-15
1
Funnel for gas generator, 50 ml, GL18
Item No. MAU-27222500
1
Round bottom flask, 100ml, GL 25/12
Item No. MAU-27100001
1
U-tube with lateral connector, GL 25
Item No. MAU-27229500
1
Test tube,180x22 mm, PN19
Item No. MAU-17080101
1
Rubber stoppers, without bore, various diameters | diameter: 17 mm
Item No. 39255-00
1
Rub.stop.d=38/31mm,1 hole 15mm
Item No. 39260-19
1
Test tube holder, up to d 22mm
Item No. 38823-00
1
Teclu burner, DIN, natural gas
Item No. 32171-05
1
Safety gas tubing, DVGW, sold by metre
Item No. 39281-10
1
Hose clip f.12-20 diameter tube
Item No. 40995-00
2
Lighter f.natural/liquified gases
Item No. 38874-00
1
Steel cylinder oxygen, 2 l, filled
Item No. 41778-00
1
Reducing valve f.oxygen
Item No. 33482-00
1
Wrench for steel cylinders
Item No. 40322-00
1
Table stand for 2 l steel cylinders
Item No. 41774-00
1
Hose clip, diam. 8-16 mm, 1 pc.
Item No. 40996-02
4
Weather monitor, 6 lines LCD
Item No. 87997-10
1
Mortar with pestle, 150 ml, porcelain
Item No. 32604-00
1
Scissors,straight,blunt,l 140mm
Item No. 64625-00
1
Tweezers,straight,blunt, 200 mm
Item No. 40955-00
1
Water jet pump, plastic
Item No. 02728-00
1
Rubber hose, various diameters | diameter: 6 mm
Item No. 39282-00
5
Protective glasses, green
Item No. 39317-00
1
Glass wool 10 g
Item No. 31773-03
1
Charcoal,small pieces 250 g
Item No. 30088-30
1
Formic acid 75% 250 ml
Item No. 30023-25
1
Sulphuric acid, 95-97%, 500 ml
Item No. 30219-50
1
Sodium hydroxide, pellets, 500 g
Item No. 30157-50
1
Water, distilled 5 l
Item No. 31246-81
1
Glycerol, 250 ml
Item No. 30084-25
1

Necessary accessories

You cannot use the article without these accessories!

Item No.
Item No.
Precision Balance, Sartorius, 620 g : 1 mg
Item No. 49311-99

Name
Filename
Filesize
Filetyp
(en) Versuchsbeschreibung
p3021667_en .pdf
Filesize 4.45 Mb
pdf
Nach oben

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