Determining The Enthalpy Change Of The Decompositi

Determining the Enthalpy Change of the decomposition of sodium enthalpy carbonate (conclusion + evaluation) Conclusion I appoint that ?H1 = 23.4 kJ/ jetty and ?H2 = 20.6 kJ/ seawall 2NaHCO3(s) ? Na2CO3(s) + H2O(l) + carbonic acid gas(g) response 1: 2NaCl(aq) + CO2(g) + H2O(l) ? 2HCL(aq) + Na2CO3 (-?H) Reaction 2: 2HCl(aq) + 2NaHCO3(s) ? 2NaCl(aq) + 2H2O(l) + 2CO2(g) (2 x ?H) The HCl, NaCl, H2O and CO2 cornerstonecel out to leave: 2NaHCO3(s) ? Na2CO3(s) + H2O(l) + CO2(g) be elbow grease: ?Hr = 2 x ?H2 + (-?H1) = 2 x 23.4 + 20.6 = 67.4 ± 2.3 (3.46%) kJ/mol = ?Hr ?Hr is exacting which means that that the reaction is remove early(a)mic i.e. cleverness was interpreted in from the surroundings. In other nomenclature more(prenominal) energy was exhausted breaking bonds, which require energy to be taken in, than qualification them, which releases energy. The literature value was found to be 90.0 kJ/mol Therefore the data-based misplay is: 90.0-67.490.0=25.1 % Since 25.1% > 3.46% (the frame-up computer error) there must have been other errors with the experiment itself to cause this. Evaluation The specialised heat capacity and the density of HCl were taken as the respective set for water. This would create a bequeath for Q which is not completely reliable (as the values for c and m would not be correct).

We could improve this by working(a) out the specific heat capacities 1.00 mol dm-3 HCl. The parallax error is a fault in this experiment, the thermometer suffered from this effect. Results can be higher than anticipate when one looks tries to make water e ye level one can go to a lower place eye le! vel and read the values incorrectly. The variations in showing angles would cause series of random errors. This error could be meliorate by the use of a digital thermometer which would negate the parallax error all together; with a digital thermometer readings would also be more precise as wellhead as more accurate. The stirring happened inconsistently and thus added a series of boosts of energising energy for the molecules rather than a unvarying stream of energizing energy. This...If you want to get a just essay, order it on our website: OrderCustomPaper.com

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