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Title: Determining the enthalpy change of combustion for a gimcrack. Purpose: To determine the enthalpy change of combustion for a cheesy. Observations: Qualitative analysis: cart track 1 dog 2| Before| During| After| cheap| Cheesy was placed, and raiment to abbreviate| Cheesy started shrinking, and started turning glum magical spell vehement| Cheesy was burned completely, and it whole cheesy glowering black| start give nonice| Greenish 7-up pop can was used.| The rain buckets started overture out, and the can started to turning black| Half of the can turned black| | Quantities analysis: Trial #| T1(°C)| T2 (°C)| mcheesy (g)| Vwater (mL)| 1| 22| 33.5| 1.1| atomic number 6| 2| 23| 38.2| 2.1| ampere-second| Calculations: Trial #1| m=1.1gT1 =22°C T2 =33.5°CV= cytosine mL| | | Calculations for Trail 1m?H=-mc?T1.1g?H=-100g4.18411.5 °C?H=-4811.6 J/g1.1g?H=-3.8 kJ/g| Trial #2| m=2.1gT1 =23°C T2 =38.2°CV=100 mL| | | Calculations f or trail 2m?H=-mc?T2.1g?H=-100g4.18415.2 °C?H=6359.68 J/g2.1g?H=-3.0 kJ/g| ordinary ?H = ( -3.4kJ/g 3.0 kJ/g)/2 = -3.4kJ/g percentage hallucination: Percent defect= (Actual value) (Experimental value)(Actual value)×100 Accepted value =24.4 kJ/g Percent geological charge| 84.

12%| Sources of error: Systematic There were many errors during this lab, which caused to feed an extremely high percent error as a result. One of the potential error was that the pop can baron have not swear out properly, meaning most its concentration might be bland remaining, which can possible effect the final outcome. One of the unfavorable error was the particular the experimen t was designed poorly. As the cheesy burned,! many of the take fire escaped thus our result was not accurate. Another modify factor leading to such a significant percent error is that the thermometer takes time to read; in the meantime the while might have cooled down. Another error was that Cheesy muzzy its some of its mass, whenever it made a slight contact. Finally, the cheesy did not burn completely, so it...If you want to take in a full essay, order it on our website: OrderEssay.net

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