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Hgfds Essay

  • Submitted by: ayadfarhat
  • on October 4, 2012
  • Category: Arts and Music
  • Length: 351 words

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Below is an essay on "Hgfds" from Anti Essays, your source for research papers, essays, and term paper examples.

BOND ENTHALPY

Aim:   to determine the enthalpy change of the reaction:
Zn+CuSo4 ZnSo4+Cu
Variables:
Independent: no change
Dependent: change in temperature and time
Control: amount of CuSo4 and Zn
 Raw Data:
Amounts of Reactants:  
25cm cubed of CuSo4 and 5g of Zn
Uncertainties:
Puppet: 25.00_+ 0.06
Thermometer: temperature _+0.5
Balance: 6.00_+0.01
Data Collected:
Time(s) | Temp trial 1 degree Celsius | Temp trial 2 degree celsius | Average |
0 | 24 | 23 | 23.5 |
0.5 | 24 | 23 | 23.5 |
1 | 24 | 24 | 24 |
1.5 | 24 | 24 | 24 |
2 | 24 | 24 | 24 |
2.5 | 24 | 24 | 24 |
3 | Zinc added | Zinc added | Zinc added |
3.5 | 42 | 36 | 39 |
4 | 49 | 47 | 48 |
4.5 | 50 | 49 | 49.5 |
5 | 49 | 49 | 49 |
5.5 | 48 | 48 | 48 |
6 | 47 | 47 | 47.5 |
6.5 | 47 | 47 | 47 |
7 | 47 | 46 | 46.5 |
7.5 | 46 | 46 | 46 |
8 | 46 | 45 | 45.5 |
8.5 | 45 | 45 | 45 |
9 | 45 | 45 | 45 |

Observations:
  * There was fizzing between the reaction of   Zn+CuSo4  
  * The temperature increased at a rapid speed once zinc was added to the copper sulphate

Data Processing:

51.5
51.5
Temp   celsius
Temp   celsius
Time(s)
Time(s)

Average Bond enthalpy
MCdeltaT
25*4.18*27.5
=2821.5 kJ mol
 
Percentage Error:
202-113/4.5*100
=48%

Percentage Uncertainty: 3.8%
 
calculation for enthalpy change:
0.025 moles = 2821.5J   -   I mole = ?
2821.5/0.025=112860
=-113KJ
Conclusion:

the enthalpy change found for the reaction of:
Zn+CuSo4 ZnSo4+Cu is -113KJ mol but the excepted value was -217KJ mol this is because there was an enormous percentage error of 48%.
Assumptions:
1st assumption: all heat is not lost
2nd assumption: that 250cm cubed = 250gr

 Evaluation:
  * Heat escaped from lid (secure lid)
  * Zinc and mass of zinc
  * Volume of Copper sulphate and assume dit had a density of 1 ( calculate dencity)
  *   Heat gone to thermometer  
  * Thermometer not always submerged in copper sulphate (add more...

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  • Submitted by: ayadfarhat
  • on October 4, 2012
  • Category: Arts and Music
  • Length: 351 words
  • Views: 380
  • Popularity Rank: 306114
  • 1 rating(s)

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Hgfds. Anti Essays. Retrieved December 9, 2018, from the World Wide Web: http://parimatch-stavka7.com/free-essays/Hgfds-319465.html


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