Wednesday, March 13, 2019

Calorimetry Essay

The purpose of this try out was to find the specific soup up formation of atomic number 12 oxide by combining the two rouse reactants use Hesss Law. The purpose was also to measure the delta T which was the final temperature deduction the initial temperature of the solution. The claim made was, based on the expected heat formation value found in magnesium metal and hydrochloric acid, the experimental enthalpy was much closer to the expected value in relation the magnesium oxide and hydrochloric acid.The equations used in this experiment were 1. MG(s)+2HCl(aq)= MgCl2(aq)+ H2(g) 2. MgO(s)+2HCl(aq)=MgCl(aq)+H2O(l) 3. H2(g) +1/2O2(g)=H2O(l). We combined the listed equations we cancelled certain values using Hesss Law to form magnesium oxide, Mg(s)+1/2O2(aq)=MgO(s). The experimental heat formation of magnesium oxide is -467.684 kJ/mol. Based on the results found, using the correlation coefficient (R2) and the maximum value of temperature final (which was found to be 70.934) we fou nd the correlation between the trend lines (expected) to the experimental. Based on the entropy found this information supported our claim.There may have been several(prenominal) computer errors in the experiment one error may have been the insufficiency of recording on time, meaning the stop watch was growed later in the reaction. Another reason for error was the lack of taking the first trials standard forcing us to estimate a mass which through off the results of the experiment in a whole. The final reason for error was not solely of the magnesium oxide that was measured was experimented.These error sources listed above, may cause numerous problems for pillow slip the estimated mass for the first trial cause the results to skew, giving us a large error percentage of -21% if this trial was taken out the error percentage would be much lower. The stop watch did not start at the same time of the experiment which may cause an amplification in the error percentage as well due t o this misplay the temperature final would be much higher. The last error was the loss of ingathering (magnesium oxide) this interfered with the experiment for the reason that based on what was expected (-601.24 kJ/mol) and what was experimented -141.990 kJ/mol was a much lower value.

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