The critical pressure is the pressure the substance can exist as a liquid at

The critical pressure is the pressure the substance

This preview shows page 5 - 9 out of 13 pages.

The critical pressureis the ______________ pressure the substance can exist as a liquid at the critical temperature heating curve 11.When energy is removed condensation begins at ____ 12.Between points D to C heat is ___________________ and temperature is ___________________.
Background image
6 13.During a phase change the change in energy is a loss of _____________________ energy since temperature measures kinetic energy and kinetic energy is constant.. 14.Draw a heating curve representing energy of ice at -20oC changing to water at 30oC 15.Draw a heating curve representing energy of steam at 140oC changing to water at 30oC single step Heat calculations H2O Hf= 6.009 kJ/mole Cs= 2.10 J/goC mp = know Hv= 40.79 kJ/mole Cl= 4.184 J/goC Bp = know Cg= 2.00 J/goC 17.1 Same phase--temperature changes q = mCT C= specific heat capacity (J/g oC) -- the energy needed to raise the temperature of 1 gram 1oC the ability of a substance to store energy as heat. 1.Calculate the heat required to cool 50.0 g water from 80.0oC to 10.0oC . 2.How much energy is needed to warm 200. g of ice from -30.oC to -10.0oC if the C of ice is 2.10 J/g oC? 3.Calculate the heat required to melt 50.0 g ice at 0.0oC to water 0.0oC. Hvmolar heat of vaporization= energy required to vaporize 1 mole 40.79 kJ/mol + H2O(l) H2O(g) molarheat of condensationis the heat that must be released condense a vapor -- opposite in sign to Hv
Background image
7 4.Calculate the heat required to condense 50.0 g steam at 100.oC to water at 100.oC. multiple step Heat calculations HEATING CURVE Calculations(phase and temperature changes) 5. Calculate the energy in kJ needed to convert 180.2 g ice at 40.0oC to steam at130.0oC. Hf= 6.009 kJ/mole Hv= 40.79 kJ/mole Cs= 2.10 J/goC Cl= 4.184 Cg= 2.00 J/goC AC increase temperature of solid mCsTs _______ kJ 1000 CD melt solid nHf_______ kJ DE increase temperature of liquid mClTl_______ kJ 1000 EF vaporize liquid nHv _______ kJ FG increase temperature of gas mCgTg_______ kJ 1000 TOTAL = 6.Suppose 100. kJ were added to the system above. What would be the final state and temperature?
Background image
7.What is the change in energy when 92.0 g ethanol cools from 70.0oC to -140.oC?
Background image
Image of page 9

You've reached the end of your free preview.

Want to read all 13 pages?

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes