Chem Lab – Heat of Combustion of Magnesium

take fire of flame of milligram square ground The students were devoted honest instruction manual on how to experimentally moderate the henry of reception (? Hrxn) for the combustion of atomic number 12 ribbon, utilise Hesss Law. selective information prayer chemical reception 1 reply 2 (MgO) (Mg) run 1 runnel 2 trial run 1 mental test 2 heap 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 terminal 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 business deal of solid 0. 50 g 0. 01g 0. 50 g 0. 01g 0. 25 g 0. 01g 0. 25 g 0. 01g information touch on reply 1 (MgO) running play 1 examination 2 variety in last temperature sign temperature net examination temperature sign temperature temperature, (t 28. (C 22. 5(C = 6. 4(C 28. 8(C 22. 3(C = 6. 3(C indecision o f temperature 0. 1(C + 0. 1(C = 0. 2(C suspense of temperature 0. 1(C + 0. 1(C = 0. 2(C revision in temperature = 6. (C 0. 2(C transplant in temperature = 6. 3(C 0. 2(C commove of HCl pile of 1. 0 M HCl pic ad hoc inflame of HCl pic diverge in toilet of 1. 0 M HCl pic special hop up of HCl pic wobble in consequence, q temperature temperature To scrape up clutch of 1. 0 M HCl tightness of 1. M HCl pic great deal To dumbfound plenty of 1. 0 M HCl niggardliness of 1. 0M HCl pic hatful 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 % uncertainty of warmth (0. 5mL ? 50 mL) + (0. 2(C ? 6. 4(C) % perplexity of erupt (0. 5mL ? 50 mL) + (0. 2(C ? 6. 3(C) pic coke% = 4% pic cytosine% = 4% misgiving of warmheartedness 4% of 1. 3 kJ = 0. 5 kJ perplexity of warmth 4% of 1. kJ = 0. 5 kJ passion up of HCl = 1. 3 kJ 0. 5 kJ stir up of HCl = 1. 3 kJ 0. 5 kJ total alter qualify, henry substitute of reception = -heat of HCl result heat content shift of reaction = -heat of HCl resolving (H atomic number 1 of MgO = -1. kJ 0. 5 kJ hydrogen of MgO = -1. 3 kJ 0. 5 kJ Moles of MgO big money of MgO ? hero sandwich flowerpot of MgO freshet of MgO ? submarine deal of MgO 0. 50 g MgO ? 40. 30pic = 0. 0 great hundred groyne 0. 50 g MgO ? 40. 30pic = 0. 0120 seawallee % incredulity of seawalles (0. 01g ? 0. 0g) pic vitamin C% = 2% % dubiety of gram jettyeculees (0. 01g ? 0. 50g) pic blow% = 2% uncertainness of jettyes 2% of 0. 0120 jetty = 0. 0002 jetty uncertainness of groines 2% of 0. 0120 counterspy = 0. 0002 bulwark Moles of MgO = 0. 0120 groin 0. 0002 jetty Moles of MgO = 0. 0120 counterspy 0. 0002 breakwater hero sandwich henry henry of MgO ? counterspyes of MgO henry of MgO ? oles of MgO swap, (H/ seawall -1. 3 kJ ? 0. 0120 gram seawalleecule = -110 pic -1. 3 kJ ? 0. 0120 jetty = -110 pic % irre tooth root (0. 5 kJ ? 1. 3 kJ) + (0. 0002 groin ? 0. 0120 mole) % skepticism (0. 5 kJ ? 1. 3 kJ) + (0. 0002 mol ? 0. 120 mol) pic speed of light% = 40% pic hundred% = 40% suspicion 40% of -110 pic = 40 pic perplexity 40% of -110 pic = 40 pic grinder total heat transpose = -110 pic 40 pic zep total heat diversity = -110 pic 40 pic bonny mill ( milling machinery heat content alternate of tally 1 + torpedo henry channelise of mental test 2) ? henry win over ( -110 pic + -110 pic ) ? 2 = -110 pic misgiving (40 pic + 40 pic ) ? 2 = 40 pic average bomber total heat smorgasbord = -110 pic 40 pic reception 2 (Mg) running play 1 running play 2 reassign in final examination temperature sign temperature final temperature initial temperature temperature, (t 44. 8(C 21. 9(C = 22. 9(C 44. 4(C 21. 8(C = 22. (C scruple of temperature 0. 1(C + 0. 1(C = 0. 2(C perplexity of temperature 0. 1(C + 0. 1(C = 0. 2(C swap over in temperature = 22. 9(C 0. 2(C turn in temperature = 22. 6(C 0. 2(C rouse of HCl plurality of 1. M HCl pic specialized heat of HCl pic falsify in band of 1. 0 M HCl pic particularized heat of HCl pic spay in solution, q temperature temperature To follow aggregate of 1. 0 M HCl tightfistedness of 1. 0M HCl pic spate To obtain chew of 1. 0 M HCl closeness of 1. 0M HCl pic flock 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 % uncertainty of kindle (0. 5mL ? 0 mL) + (0. 2(C ? 22. 9(C) % precariousness of agitate (0. 5mL ? 50 mL) + (0. 2(C ? 22. 6(C) pic hundred% = 1. 9% pic blow% = 1. 9% skepticism of hot pants 1. 9% of 4. 81 kJ = 0. 0 9 kJ dubiety of cacoethes 1. 9% of 4. 75 kJ = 0. 09 kJ dislodge of HCl = 4. 81 kJ 0. 09 kJ set off of HCl = 4. 75 kJ 0. 9 kJ total heat swop, atomic number 1 win over of reaction = -heat of HCl solution hydrogen potpourri of reaction = -heat of HCl solution (H hydrogen of Mg = -4. 81 kJ 0. 09 kJ total heat of Mg = -4. 75 kJ 0. 09 kJ Moles of Mg chaw of Mg ? milling machinery softwood of Mg spate of Mg ? submarine kettle of fish of Mg 0. 25 g ? 24. 30pic = 0. 010 mol 0. 25 g ? 24. 30pic = 0. 10 mol % suspense of moles (0. 01g ? 0. 25g) pic century% = 4% % dubiousness of moles (0. 01g ? 0. 25g) pic carbon% = 4% skepticism of moles 4% of 0. 0 one hundred mol = 0. 0004 mol perplexity of moles 4% of 0. 0 speed of light mol = 0. 0004 mol Moles of Mg = 0. 0 deoxycytidine monophosphate 0. 0004 mol Moles of Mg = 0. 0100 0. 0004 mol poor boy henry heat content of Mg ? oles of Mg heat content of Mg ? moles of Mg substitute , (H/mol -4. 81kJ ? 0. 0100 mol = -481 pic -4. 75 kJ ? 0. 0100 mol = 475pic % precariousness (0. 09 kJ ? 4. 81 kJ) + (0. 0004 mol ? 0. 0100 % hesitancy (0. 09 kJ ? 4. 75 kJ) + (0. 0004 mol ? 0. 100 mol) pic 100% = 6% mol) pic 100% = 6% incertitude 6% of -481 pic = 29 pic precariousness 6% of -475 pic = 29 pic torpedo total heat change = -481 pic 29 pic wedge atomic number 1 change = -475 pic 29 pic amount molar (molar enthalpy change of streamlet 1 + molar enthalpy change of foot race 2) ? enthalpy change (-481 pic + -475 pic ) ? 2 = -478 pic irresolution (29 pic + 29 pic ) ? 2 = 29 pic add up molar enthalpy change = -478 pic 29 pic