QuestionQuestion

Transcribed TextTranscribed Text

ENTHALPY AND CALORIMETRY II Report Sheet PART A: Enthalpy of Solution MgSO4 Trial 1 MgSO4Trial 2 Volume of H2O Volume of H2O Mass of H2O Mass of H2O Temperature of H2O Temperature of H2O Mass of weigh boat Mass of weigh boat Mass of boat and salt Mass of boat and salt Mass of salt Mass of salt Temperature of Solution Temperature of Solution Change in temperature Change in temperature Calculations (Show all calculations below) 1. Heat gained (lost) by the solution. 2. Heat lost (gained) by the salt. 3. Moles of salt 4. ΔHsoln. K2SO4 Trial 1 K2SO4 Trial 2 Volume of H2O Volume of H2O Mass of H2O Mass of H2O Temperature of H2O Temperature of H2O Mass of weigh boat Mass of weigh boat Mass of boat and salt Mass of boat and salt Mass of salt Mass of salt Temperature of Solution Temperature of Solution Change in temperature Change in temperature Calculations (Show all calculations below) 5. Heat gained (lost) by the solution. 6. Heat lost (gained) by the salt. 7. Moles of salt 8. ΔHsoln. KNO3 Trial 1 KNO3 Trial 2 Volume of H2O Volume of H2O Mass of H2O Mass of H2O Temperature of H2O Temperature of H2O Mass of weigh boat Mass of weigh boat Mass of boat and salt Mass of boat and salt Mass of salt Mass of salt Temperature of Solution Temperature of Solution Change in temperature Change in temperature Calculations (Show all calculations below) 9. Heat gained (lost) by the solution. 10. Heat lost (gained) by the salt. 11. Moles of salt 12. ΔHsoln. NH4NO3 Trial 1 NH4NO3 Trial 2 Volume of H2O Volume of H2O Mass of H2O Mass of H2O Temperature of H2O Temperature of H2O Mass of weigh boat Mass of weigh boat Mass of boat and salt Mass of boat and salt Mass of salt Mass of salt Temperature of Solution Temperature of Solution Change in temperature Change in temperature Calculations (Show all calculations below) 13. Heat gained (lost) by the solution. 14. Heat lost (gained) by the salt. 15. Moles of salt 16. ΔHsoln. PART B: Hot/Cold Pack Calculations: Show all work below Salt Assigned _____________ Mass Assigned _____________ Temperature Assigned _____________ 1. Change in temperature 2. Heat to be gained or lost 3. Moles of salt 4. Mass of salt 5. Mass of water Final Temperature of your mixture. Include a screen shot of your result. _____________________ Questions 1. Determine the ΔG°soln at 298K for the salt you used in your chemical hot/cold pack. Use the ΔH°soln that you determined in Part A and calculate ΔS°soln using the values of the aqueous ions and the solid material from Appendix II-B of your textbook. Is the dissolution of your salt spontaneous? 2. Determine the ΔG°soln at 298K for K2SO4. Use the ΔH°soln that you determined in Part A and calculate ΔS°soln using the values of the aqueous ions and the solid material from Appendix II-B of your textbook. Is the dissolution of K2SO4 spontaneous? 3. Determine the ΔG°soln at 298K for KNO3. Use the ΔH°soln that you determined in Part A and calculate ΔS°soln using the values of the aqueous ions and the solid material from Appendix II-B of your textbook. Is the dissolution of KNO3 spontaneous? 4. Based on your your values for ΔH°soln and ΔS°soln for KNO3 and K2SO4, would these salts be more appropriate for making a chemical hot pack or cold pack? Or would one be good for a hot pack and one good for a cold pack? Explain your answer in your own words. 5. We will now compare ammonium nitrate to potassium nitrate. a. Calculate the ΔH°soln for ammonium nitrate using the values in the appendix of your textbook. b. Is the ΔH°soln of potassium nitrate larger or smaller than ΔH°soln of ammonium nitrate? _______________ c. Based only on the ΔH°soln values would potassium nitrate be a better or worse chemical cold pack? Briefly explain your answer in your own words. d. Calculate the mass of both salts required to lower the temperature of 500g of water by 9°C (from 25°C to 16°C). NH4NO3 KNO3 e. Ammonium nitrate costs $123/500g. Potassium nitrate costs $224/500g. In your own words explain why manufacturers might use ammonium nitrate rather than potassium nitrate.

Solution PreviewSolution Preview

These solutions may offer step-by-step problem-solving explanations or good writing examples that include modern styles of formatting and construction of bibliographies out of text citations and references. Students may use these solutions for personal skill-building and practice. Unethical use is strictly forbidden.

    By purchasing this solution you'll be able to access the following files:
    Solution.docx.

    $35.00
    for this solution

    or FREE if you
    register a new account!

    PayPal, G Pay, ApplePay, Amazon Pay, and all major credit cards accepted.

    Find A Tutor

    View available Chemistry - Other Tutors

    Get College Homework Help.

    Are you sure you don't want to upload any files?

    Fast tutor response requires as much info as possible.

    Decision:
    Upload a file
    Continue without uploading

    SUBMIT YOUR HOMEWORK
    We couldn't find that subject.
    Please select the best match from the list below.

    We'll send you an email right away. If it's not in your inbox, check your spam folder.

    • 1
    • 2
    • 3
    Live Chats