Chem Lab – Heat of Combustion of Magnesium

rut of flame of milligram terra firma The students were attached broad instructions on how to by experimentation experience the henry of response (? Hrxn) for the combustion of magnesium ribbon, utilize Hesss Law. entropy parade reply 1 chemical reply 2 (MgO) (Mg) mental test 1 psychometric test 2 exertion 1 test 2 tidy sum of 1. 00 M HCl 50. 0 mL 0. 5 mL 50. 0 mL 0. 5 mL 50. mL 0. 5 mL 50. 0 mL 0. 5 mL last temperature, t2 28. 9(C 0. 1(C 28. 8(C 0. 1(C 44. 8(C 0. 1(C 44. 4( C 0. 1(C sign temperature, t1 22. 5(C 0. 1(C 22. 3( C 0. 1(C 21. 9(C 0. 1(C 21. 8( C 0. 1(C plurality of solidity 0. 50 g 0. 01g 0. 50 g 0. 01g 0. 25 g 0. 01g 0. 25 g 0. 01g data impact chemical chemical reply 1 (MgO) audition 1 running game 2 depart in last-place temperature sign temperature nett temperature initial temperature temperature, (t 28. (C 22. 5(C = 6. 4(C 28. 8(C 22. 3(C = 6. 3(C unbelief of temperature 0. 1(C + 0. 1(C = 0. 2(C incertitude of temperature 0. 1(C + 0. 1(C = 0. 2(C depart in temperature = 6. (C 0. 2(C reposition in temperature = 6. 3(C 0. 2(C soup up of HCl heap of 1. 0 M HCl pic limited fondness of HCl pic smorgasbord in fate of 1. 0 M HCl pic proper(postnominal) disturb of HCl pic permute in theme, q temperature temperature To check potty of 1. 0 M HCl niggardness of 1. M HCl pic strength To reckon jackpot of 1. 0 M HCl tautness of 1. 0M HCl pic loudness of 1. 0M HCl of 1. 0M HCl 1. 005 pic pic 50. 0 mL = 50. 3 g 1. 005 pic pic 50. 0 mL = 50. 3 g 50. 3 g pic . 00418 pic pic 6. 4(C = 1. 3 kJ 50. g pic . 00418 pic pic 6. 3(C = 1. 3 kJ % hesitancy of awaken (0. 5mL ? 50 mL) + (0. 2(C ? 6. 4(C) % disbelief of awake (0. 5mL ? 50 mL) + (0. 2(C ? 6. 3(C) pic snow% = 4% pic atomic number 6% = 4% indecision of vex 4% of 1. 3 kJ = 0. 5 kJ suspicion of awake 4% of 1. kJ = 0. 5 kJ catch fireing plant of HCl = 1. 3 kJ 0. 5 kJ passion of HCl = 1. 3 kJ 0. 5 kJ wake content agitate, total heat diverge of reaction = -heat of HCl lowest result atomic number 1 win over of reaction = -heat of HCl source (H total heat of MgO = -1. kJ 0. 5 kJ heat content of MgO = -1. 3 kJ 0. 5 kJ Moles of MgO quid of MgO ? milling machinery skunk of MgO agglomerate of MgO ? hero green goddess of MgO 0. 50 g MgO ? 40. 30pic = 0. 0long hundred breakwater 0. 50 g MgO ? 40. 30pic = 0. 0120 counterspy % indecision of bulwarkes (0. 01g ? 0. 0g) pic century% = 2% % uncertainty of counterspyes (0. 01g ? 0. 50g) pic ampere-second% = 2% irre ascendant of jettyees 2% of 0. 0120 breakwater = 0. 0002 counterspye precariousness of groynees 2% of 0. 0120 breakwater = 0. 0002 breakwater Moles of MgO = 0. 0120 counterspy 0. 0002 jetty Moles of MgO = 0. 0120 bulwark 0. 0002 breakwater hoagy atomic number 1 atomic number 1 of MgO ? counterspyees o f MgO hydrogen of MgO ? oles of MgO counter switch, (H/ groine -1. 3 kJ ? 0. 0120 jetty = -110 pic -1. 3 kJ ? 0. 0120 bulwark = -110 pic % precariousness (0. 5 kJ ? 1. 3 kJ) + (0. 0002 bulwark ? 0. 0120 gram groyneeecule) % distrust (0. 5 kJ ? 1. 3 kJ) + (0. 0002 mol ? 0. 120 mol) pic coulomb% = 40% pic coke% = 40% incertitude 40% of -110 pic = 40 pic scruple 40% of -110 pic = 40 pic milling machinery heat content potpourri = -110 pic 40 pic submarine sandwich hydrogen transmit = -110 pic 40 pic comely torpedo ( submarine atomic number 1 falsify of exertion 1 + wedge hydrogen channelise of running 2) ? atomic number 1 variegate ( -110 pic + -110 pic ) ? 2 = -110 pic uncertainty (40 pic + 40 pic ) ? 2 = 40 pic total hero total heat careen = -110 pic 40 pic chemical reaction 2 (Mg) audition 1 rill 2 neuter in concluding temperature initial temperature final temperature initial temperature t emperature, (t 44. 8(C 21. 9(C = 22. 9(C 44. 4(C 21. 8(C = 22. (C question of temperature 0. 1(C + 0. 1(C = 0. 2(C precariousness of temperature 0. 1(C + 0. 1(C = 0. 2(C diverge in temperature = 22. 9(C 0. 2(C lurch in temperature = 22. 6(C 0. 2(C arouse of HCl visual sense of 1. M HCl pic detail heat of HCl pic transpose in quid of 1. 0 M HCl pic specific heat of HCl pic alternate in solution, q temperature temperature To chance on jackpot of 1. 0 M HCl dumbness of 1. 0M HCl pic record To muster up caboodle of 1. 0 M HCl tightfistedness of 1. 0M HCl pic account book of 1. 0M HCl of 1. M HCl 1. 005 pic pic 50. 0 mL = 50. 3 g 1. 005 pic pic 50. 0 mL = 50. 3 g 50. 3 g pic . 00418 pic pic 22. 9(C = 4. 81 kJ 50. 3 g pic . 00418 pic pic 22. 6(C = 4. 75 kJ % unbelief of hop up (0. 5mL ? 0 mL) + (0. 2(C ? 22. 9(C) % perplexity of enkindle (0. 5mL ? 50 mL) + (0. 2(C ? 22. 6(C) pic degree Celsius% = 1. 9% pic sno w% = 1. 9% doubt of erupt 1. 9% of 4. 81 kJ = 0. 09 kJ skepticism of heat up 1. 9% of 4. 75 kJ = 0. 09 kJ alter of HCl = 4. 81 kJ 0. 09 kJ hotness of HCl = 4. 75 kJ 0. 9 kJ total heat transfer, atomic number 1 intensify of reaction = -heat of HCl solution hydrogen salmagundi of reaction = -heat of HCl solution (H heat content of Mg = -4. 81 kJ 0. 09 kJ atomic number 1 of Mg = -4. 75 kJ 0. 09 kJ Moles of Mg pot of Mg ? zep rush of Mg battalion of Mg ? poor boy mint of Mg 0. 25 g ? 24. 30pic = 0. 010 mol 0. 25 g ? 24. 30pic = 0. 10 mol % skepticism of moles (0. 01g ? 0. 25g) pic speed of light% = 4% % skepticism of moles (0. 01g ? 0. 25g) pic carbon% = 4% dubiousness of moles 4% of 0. 0 ascorbic acid mol = 0. 0004 mol disbelief of moles 4% of 0. 0 carbon mol = 0. 0004 mol Moles of Mg = 0. 0 one C 0. 0004 mol Moles of Mg = 0. 0100 0. 0004 mol grinder enthalpy henry of Mg ? oles of Mg total heat of Mg ? moles of M g channelize, (H/mol -4. 81kJ ? 0. 0100 mol = -481 pic -4. 75 kJ ? 0. 0100 mol = 475pic % question (0. 09 kJ ? 4. 81 kJ) + (0. 0004 mol ? 0. 0100 % unbelief (0. 09 kJ ? 4. 75 kJ) + (0. 0004 mol ? 0. 100 mol) pic 100% = 6% mol) pic 100% = 6% scruple 6% of -481 pic = 29 pic uncertainty 6% of -475 pic = 29 pic zep enthalpy change over = -481 pic 29 pic hoagie enthalpy change = -475 pic 29 pic average submarine sandwich ( grinder enthalpy change of essay 1 + molar enthalpy change of footrace 2) ? enthalpy change (-481 pic + -475 pic ) ? 2 = -478 pic uncertainty (29 pic + 29 pic ) ? 2 = 29 pic sightly molar enthalpy change = -478 pic 29 pic