So as to get the moles of the solid, you must use the formula for moles:
n = mass/ Molecular Weight.
If you want the moles of Mg: n= 0.494g/ 24.305g/mol = 0.0203moles of Mg
Now for MgO: n= 0.494g/(24.305g/mol + 15.9994g/mol) = 0.0122 moles of MgO.
Then for the enthalpy:
As you inverted reaction 1, your enthalpy must be inverted as
well, by multiplying times -1. To get your enthalpy for reaction 4:
-\delta H1 + \delta H2 + \delta H3 = \delta H4.
The first two enthalpies are those that you already calculated,
whilst the third is the one for water formation, found in tables.
(-285.8kJ/mol) .
need help with Enthalpy assignment, i cant figure it out all question help Calculations PART I-Mg 1. Calculate the heat energy. q. released by the reaction of Mg and HCl using the combined mass of all the reactants. 2. Calculate the enthalpy of this reaction, AH , in kJ/gram using the grams of Mg. (Note the sign of AH in your answer). 3. Calculate the enthalpy of this reaction, AHran, in kJ/mol using the molar mass of Mg. (Note the...
BG35.2 Enthalpy of Formation of Mgo Page 9 of 12 PRELAB QUESTIONS 1. Read the writeup through the Data Analysis section. A student carried out the experiment described there. The student used 0.4894 g of Mg in the first reaction and found that the temperature of the solution went from 22.1 to 42.7'C. In the second reaction, 0.803 g of MgO was used and the solution went from 22.7 to 28.7°C. Calculate the following (show the calculations beside and/or below...
help with 10 and 11 please DATA AND CALCULATIONS Reaction 1 (Mgo) 100 g 27.7 1. Mass of 1.00 MHCI 2. Final temperature, 3. Initial temperature, 4. Change in temperature, at 5. Mass of solid °C °C Reaction 2 (Mig) 0.50 40.2 19.6 20.6 0.508 0 "C 1.0009 6. Heat, 3.39 8.61 7. AH -3. 39 -8.61 8. Moles 100g/40 rol = 2.5 0.021 mol Mg mol Mgo -8.61/0001 9. Himol -3.39/2.5 =-1.36 -410 ki/mol k mol E-l36 AHE-410 AH...
Experiment 19 DATA AND CALCULATIONS Reaction 1 (MgO) Reaction 2 (Mg) 1. Volume of 1.00 M HCl 2. Final temperature, t 3. Initial temperature, 4. Change in temperature, ar 2 eC 5. Mass of solid 6. Heat, q kJ 7. AH 8. Moles mol Mgo mol Mg 10. Determine ??mol Mg for reaction (4)". 11. Percent error
please help fill in data table and answer questions. please show all work. thank you! Reaction 2 (Ma Reaction 1 (Mgo) 1. Volume of 1.00 M HCT 2. Final temperature, t 3. Initial temperature, t, EO.O ml 50.0 mt 28 a0 oc 4. Change in temperature, t 5. Mass of solid 203 MgO 6. Heat, q k.J kJ kJ k.I 8. Moles mol Mg mol MgO 9. ΔΗ/mol kJ/mol kJ/mol 10. Determine ΔΗ/mol Mg for reaction (4). (10.) II. Percent...
Please help fill in data table and answer questions. thank you! Date DATA Reaction 1 (Mgo) Reaction 2 (Mg) T. Volume of 1.00 M HCI 2. Final temperature, t 3. Initial temperature, t 50.0 m 50.0 mL Bc -C 20.8 C 4. Change in temperature, t 5. Mass of solid 6. Heat, q 7. ΔΗ 8. Moles mol Mgo mol Mg kJ/mol kJ/mol 10. Determine ΔH/mol Mg for reaction (4)" (10.) 11. Percent error Outside of lab, you must print...
Hi.can you help me answer 5)a)b)c).thank you so much for your help and kindness.I appreciate it 510). i. calculate the standard entalpy change for the reactichi Mg + % 0 Mgo Given the following dator Mg + 2HCl + Mg(12th, fH, L AH: -157:01 kJ AH MgO + 2H01 - MgCl₂ + H₂O | 1 Hº, -120 kg. H₂ + 1/ O H₂O A t= -286 kJ m. Calculate the enthalpy change for the reaction in C4 Hugo + Hng...
i just need to do the blank parts and i do not understand how i believe all the information should he there. whats needed is the calculation for delta Hm, rxn2 for both trials and delta Hf defree MgO LOUILL Dtherwise noted, 2pts.for each blank equation, and box) Trial 1 Trial 2 Volume of 3.00 M HCI 86.5L Mass of Mg Mass of 3.00 MHCI.ubs (calculated) Total Mass Mole product if HCI limiting reactant 91 .H-L_ (1 pt. each) 0.8459...
THERM OCHEMISTRY I1: HESS'S LAW OF CONSTANT HEAT SUMMATION ADVANCED PROBLEM ASSIGNMENT Dare Section Name READ THE EXPERIMENTAL DISCUSSION FIRST SHOW CALCULATION SET-UPI SIGNS! SIGNIFICANT FIGUREESi The 1.00 M solutions of HNO, and NaOH used in this experiment are prepared by diluting 6.00 M stock solutions. 1 What volume of 6.00 M stock solurion and whar volume of water is required to prepare 50.0 mL of 1.0 M solution? mL H.O mL 6.00 M Stock Solution How many moles of...
Please help fill in data table and answer questions below table. thank you! It was only 2 reactions, there is not a 4th. Please help with information provided. DATA 1. Volume of 1.00 M HCI 2. Final temperature, t, 3. Initial temperature, t, 4. Change in temperature, t 5. Mass of solid 6. Heat, Reaction 2 (Mg) Reaction 1 (Mgo) 50.0 41.3 500 ml mL oC oC oC oC Mg kJ kJ 7. ΔΗ kJ kJ 8. Moles mol Mg...