The literature value for the standard enthalpy of formation of MgO is given to be -601.2kJ.mol-1. H2 (g) + O2 (g) → H2O (l) ———- ΔHH2O = -285 kJ.mol-1. The literature value for ΔHMgO was given to be -601.2kJ.mol-1 therefore the value in the range closest to the literature value (-504.5kJ.mol-1) is still 16.1% off. By continuing we’ll assume you’re on board with our cookie policy, The input space is limited by 250 symbols. water (g)115.40 Hess’s law could be used to calculate the heat of combustion of magnesium. When this temperature change is multiplied by the heat capacity, the amount of heat needed to raise the temperature of a body by one degree, we can measure the change in converting our initial components (reactants) to their respective products. A burette was the choice of apparatus since it had a lower random error and was as easy to use as a common measuring cylinder or a beaker. We use cookies to give you the best experience possible. * ΔHX (Trial 1) = = 249000J = -249kJ.mol-1. All trials, the HCl was withdrawn from the same 2.0M stock solution prepared. In this experiment we will measure the amount of heat released from 3 reactions (ΔHA ΔHB ΔHC) and calculate the sum of all 3 reactions to determine ΔHT, which will give us the heat formation of MgO. While filling up the burette, it ensured that only the person would be in-charge since due to height differences, parallax errors of different magnitudes could be introduced introducing unwanted random errors (inconsistent systematic errors). Essay, Use multiple resourses when assembling your essay, Get help form professional writers when not sure you can do it yourself, Use Plagiarism Checker to double check your essay, Do not copy and paste free to download essays. For 120 seconds, 24 readings were taken and noted in a pre-made data collection table. Figure 4: Zoomed in view of the y-axis and horizontal line intersection. For the best estimation of maximum temperature reached, a magnified view of the intersection of horizontal line and y-axis is useful. Flashbulbs are a popular source of light To determine the accuracy of the calculation we can determine the % error: As far as accuracy goes a percent error of 2.75% is very acceptable. 5. * Absolute uncertainty of value for ΔHMgO = 49.8 + 22.5 = 72.3. The work-table was wiped clean and dried before and after the experiment. Only after investments in a better calorimeter and an analytical balance have been made, should one think to invest in a 15cm3 pipette. Should Parents Be Punished for Crimes Their Children Commit? → MgCl2 (aq.) To be used for keeping a track of time elapsed while performing the experiment because every five seconds, a thermometer reading had to be taken. To be used when weighing out MgO powder. Mass of Calorimeter (g)1.79 Using the burette, 15cm3 of 2M HCl was withdrawn into the calorimeter and was allowed to sit for a minute or two so that its temperature reaches the ambient temperature. To be used for reacting with Mg in part X and MgO in part Y. To be used for accurately cutting strips of Magnesium with straight ends. The temperature of the acid was then measured using the thermometer and its reading noted. (2017, Nov 12). According to the textbook, the accepted value for ΔHT=-601.8 kJ/mol. Then using mathematical formulas we were able to calculate the heat formation of MgO, which is measured in kJ/Mol. By continuing we’ll assume you’re on board with our cookie policy, The objective of this experiment was to determine the change in enthalpy when one mole of Magnesium (Mg) reacts with half a mole of Oxygen (O2) to give one mole of Magnesium Oxide (MgO). Do you think if it was to be your child doing this you should be held accountable for their crime? Since the enthalpies of reaction for both reaction 1 and reaction 2 are known, Hess’ law can be applied and the following method can be used for calculating the value for ΔHMgO. Since both reactions are in dilute water solutions of HCl it was necessary to know the heat capacity of water, but b… 7. e. it too will produce heat to the surroundings. Help. Graphical analysis similar to that used in Part Y, Trial 1 has been used to determine the maximum temperature reached in the duration of the reaction. I believe parents should not be held responsible for crimes that their children committed because they did not force their child/children to do the crime. 3. The enthalpy of reaction for each of these reactions can then be added together to give the enthalpy of reaction of the primary reaction (formation of MgO, in this case). From the figure, the value for the maximum temperature reached can be safely estimated to be 34.05oC. Final temperature of HCl + Mg (°C)42.0 Often times, the reading was taken up to a second later. To measure the 3cm strip of Magnesium and to measure out 0.05g of MgO. Petri dishes are easy to clean and the amount of powder on it can be adjusted very easily because they are shallow. Mass of Cal + room temp water + ice Another assumption that has led to the underestimation of the final value of ΔHMgO is the assumption that the solution had the same specific heat capacity of water. To minimize heat loss from the calorimeter through convection currents. The Preamble to an act is the lodestar and guides those who find themselves in a grey dealing with its provision. Using the calorimeter one can then determine the rise and fall in temperature of the reaction. Heat that would be released if 1 mole of MgCl2 would be formed = Standard Enthalpy of Reaction, * Standard Enthalpy of reaction calculated for this trial =. The container claimed to contain MgO with only trace amounts of impurities. The strips were weighed each time on the same electronic balance and each time, the mass of Magnesium was approximately the same. Clearly, the solution contained Magnesium metal (in part X) or MgO (in part Y) which leads to an increase in the specific heat capacity of the solution. 2. To be used to wash the calorimeter before using it for the next trial. Temp Water (g)48.08 qB= (101.76 g + 0.158 g) x 4.184 J/g°C x 5.50°C. At the reaction site (calorimeter), the solution was not bubbling. Ming and her sister who is home from college for spring break organized a bake sale to benefit the victims of the fire. A temperature logger would also eliminate human errors in the following ways: * Since temperature reading was required every 5 seconds, it was very difficult to accurately read the thermometer so quickly avoiding all possible parallax errors.
Blog Introduction Samples, Camargue Horses Photography, Sociological Imagination Examples College, Nee Kannodu Kannodu Kannoram, Used 20 Inch Rims For Sale Craigslist, Found Bedbugs In Hotel Now What, Half Bezel Setting, Nee Kannodu Kannodu Kannoram, Harshal Patel Ipl 2020 Salary, Fight For Survival Poe, Camargue Horses Photography, Black Vulture South Carolina, Online Clothing Wholesalers,