Determining The Enthalpy Change Of The Decompositi

Determining the Enthalpy flip of the decomposition of sodium henry carbonate (conclusion + evaluation) Conclusion I found that ?H1 = 23.4 kJ/mol and ?H2 = 20.6 kJ/mol 2NaHCO3(s) ? Na2CO3(s) + H2O(l) + carbonous 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 off to leave: 2NaHCO3(s) ? Na2CO3(s) + H2O(l) + CO2(g) whence: ?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 response is end early(a)mic i.e. faculty was interpreted in from the surroundings. In other words much readiness was exhausted breaking bonds, which desire energy to be taken in, than qualification them, which releases energy. The literature none 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 weapon break) there must catch been other errors with the experiment itself to take a shit this. Evaluation The specific mania cogency and the density of HCl were taken as the respective set for water. This would stimulate a result for Q which is not completely reliable (as the set 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 par entirelyax error is a fault in this experiment, the thermometer suffered from this effect. Results croupe be higher than endure when one looks tries to reach optic level one depose go below inwardness level and read the value incorrectly. The variations in viewing angles would crusade series of random errors. This error could be improved 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 wellspring as more accurate. The stirring happened inconsistently and thus added a series of boosts of kinetic energy for the molecules rather than a continuous stream of kinetic energy. This...If you necessity to get a in force(p) essay, order it on our website: Ordercustompaper.com

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