Evaluating an enthalpy change that can not be measured directly

Title: Evaluating an enthalpy change that can not be measured directly
Category: Science & Technology / Chemistry
Details: Words: 670 | Pages: 2.9 (approximately 235 words/page)

Evaluating an enthalpy change that can not be measured directly

Chemistry Experiment. Dr. Watson. Evaluating An Enthalpy Change That Cannot Be Measured Directly. Introduction. We were told that sodium hydrogencarbonate decomposes on heating to give sodium carbonate, water and carbon dioxide as shown in the equation below:-         2NaHCO3(s)--------> Na2CO3 (s) + H2O (l) + CO2 (g) = DeltaH1 This was given as deltaH1 and we had to calculate as part of the experiment. This however cannot be measured directly, but can be found using …showed first 75 words of 670 total…

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…showed last 75 words of 670 total…reaction vessel. Also heat may well have been lost through the open top of the container, even though there was a lid this was not very secure some heat will have escaped through here. In summation the experiment was very difficult to undertake as the enthalpy change for DeltaH1 is hard to determine due to the fact that it thermally decomposes in the air, causing great problems in calculating its enthalpy change with its surroundings.

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