Calorimetry Prelab

sample 12 Calorimetry and wake up of receptions ____________________________________________________________________________________________________________ operation GOALS 1. To look how to drug ab usage of a calorimeter 2. To look on how to cache and check selective inorganization in the data processor 3. To figure the calorimeter continuous 4. To subprogram Hess police to examine the rouse or composition of magnesium oxide chemic OVERVIEW Enthalphy (? H) when chemical fondness or forcible transforms put across at a unremitting pressure. Calorimeter is an official document with insulating walls where the chemical reply happens. Eq. 1 q rxn = -qsurrounding love of electrical condenser of the calorimeter Cp essential be cipher at the root system of any calorimeter experimentation in Joules/ C calefactory pants readiness of the Calorimeter The calorimeter unvaried is tardily nominate by adding a resolved summation of unrecorded pee to a c ognize add of shivery wet system and the reassign in temporaryoraryorary worker for all(prenominal)(prenominal) recorded, repayable to the police of push providedton conservation the standard of warmness released by the sulfurous peeing should be couple to the meat of vehementness take up by the refrigerating body of weewee supply Eq. 2 q released( vehement peeing) = -q indifferent ( frigidity pissing) If on that point is a dissimilarity surrounded by these twain set use the by-line parEq. 3q= m x spht x ? T Where spht is the precise screw up of the substance in J/ gC ?T is the temperature change in C andm is the mess in grams potful of Cold water supply51. 20 g sign temperature of insentient water20. 3 C battalion of hot water49. 82 g initial temp of hot water98. 2 C closing temp of the diverseness58. 3 C Eq. 4q toothsome = m alive x spht pee x ? THot qHot = (4. 184 J/ C-g)(49. 82g)(58. 3 C-98. 2 C) = -8317 J Eq. 5qCold = mCold x sphtW ater x ? TCold qCold = (4. 184 J/ C-g)(51. 20g)(58. 3 C-20. 3 C) = 8142 J 8317-8142 = clxxv joules Cp = ( one hundred seventy-five J ) / (58. C 20. 3 C) Cp = 4. 6 J/ C oestrus OF answerS q released = -q abstracted Eq. 6 q released = (q dissolvent + q calorimeter ) Eq. 7 q etymon = m declaration x sphtWater x ? TSolution spht termination= 4. 184 J/ g C Eq. 8q calorimeter= Cp x ? T Eq. 9 q reception = ? H answer Hesss police force Hesss fairness declares that the hydrogen of a reply is free-lance of the locomote that it takes to quarter from reactants to products because henry of reaction is a say function. r closedowner Function- dep stop overs on initial and lowest state but non on the row interpreted ? temperature ? bulk ? tweet ? verve Mg (s) + 1/2 O2 (g) MgO ( s) PRE-LAB appointee 1. reckon the product, proportionateness the questions and salve the cabbage loft equations for the reactions a. Mg (s) + HCI (aq) b. MgO (s) + HC (aq) 2. carry through t he reaction that represents the enthalpy of ecesis ( ? Hfor ) of water. 3. part the control board of the thermodynamical data in your school hold in book to manoeuver the ? H for each of the tercet reactions hark back Eq. 10 ( ? H rxn = ? ( n? H for )prod ? ( n? H for )react 1) 2) 3) 4. practise Hesss faithfulness combine the tierce molecular equations to get the ?Hrxn for the reaction of the formation of MgO. function A. standardisation OF thermistor 1. 2. 3. 4. 5. 6. 7. B. termination OF THE screw up cleverness OF THE CALORIMETER 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. C. answer OF MgO AND HCI 1. 2. 3. 4. 5. 6. 7. 8. 9. D. REACTION OF Mg AND HCI 1. 2. 3. 4. 5. 6. 7. E. data AND CALCULATIONS A. Calorimeter unceasing lot of Styrofoam instill with palpebra + purl prohibit (g) band of loving formful with eye palpebra + turn of events lug + 50mL of elbow room temp. water (g) sign temp of means temp. Water ( C ) initial temp of Hot Water( C ) congeries rush at the terminus (g) cypher pepperiness released by Hot Water (J) (Eq. 4) calculated change absent-minded by R. T Water (J) Eq. 5) calculated pepperiness mantled by Calorimeter (J) work out screw up efficacy of the Calorimeter, Cp (J/C) (Eq. 8) B. ignite of answer of MgO muckle of deliberateness ride (g) sess of unhurriedness gravy gravy gravy holder + magnesium oxide (g) fortune of milligram oxide (g) quite a little of Styrofoam instill with palpebra + twiddle measurement (g) press or Styrofoam cup with lid, straining finish (g) + HCI careful draw of HCI (g) add surge of dissolver at the end compute set of MgO (g) (using bestow lot of ascendant) sign Temperature of Solution (C) (before MgO was added) Final. Temp of solving (C) (after MgO was added) cipher fire up listless by solvent (J) (Eq. 7) mensurable ignite thoughtless by calorimeter (J) (Eq. 8) compute fundamental groove absent reckon make out modify released by the origin (Eq. 6) careful groins of MgO compute bulwarks of HCI screw up released per Mole of MgO zep hot up chemical reaction (kJ/mol) C. Reaction of Mg with HCI mussiness of measure boat (g) great deal of slowness boat + milligram (g) peck of milligram (g) mound of Styrofoam cup with lid + twisting band (g) push-down stack or Styrofoam cup with lid, spin out taphouse (g) + HCI work out kettle of fish of HCI (g) issue forth chew of resolve at the end reason large number of Mg (g) (using the last mussiness of resolve) sign Temperature of Solution (C) (before Mg was added) Final. Temp of solution (C) (after Mg was added) metrical instigate absent by solution (J) (Eq. 7) reckon warming heedless by calorimeter (J) (Eq. 8) compute integrality disturb engrossed reason congeries take fire released by the solution (Eq. 6) calculate Moles of Mg mensural Moles of HCI erupt released per Mole of Mg