{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Practice_Problems

Practice_Problems - 1 What is the sign of the entropy...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1. What is the sign of the entropy change in each chemical reaction? a)  ice melting (b)  water vapour condensing (c)  sugar dissolving in water (d)  HCl(g) + NH3(g) NH4Cl(s) (e)  CaCO3(s) CaO(s) + CO2(g) 2. What is the sign of the entropy change in each chemical reaction? (a)  N2O4(g) 2NO2(g) (b)  PCl3(g) + Cl2(g) PCl5(g) (c)  2Al(s) + 3O2(g) 2 Al2O3(s) (d)  N2(g) + 3H2(g) 2NH3(g) e)  S(s) + O2(g) SO2(g) 3. When water freezes, the phase change that occurs is exothermic. H2O( _ ) H2O(s) delta H = 6.02 kJ Based on the change in enthalpy, you would expect that water would always freeze. Use the concepts of entropy and free energy to explain why this phase change is favorable only below 0°C. 6.  The following reaction took place in a sealed flask at 250°C. PCl5(g) __ PCl3(g) + Cl2(g)
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
At equilibrium, the gases in the flask had the following concentrations: [PCl5] = 1.2 10 2 mol/L, [PCl3] = 1.5 10 2 mol/L, and [Cl2] = 1.5 10 2 mol/L. Calculate the value of K c at 250°C. 7.  Iodine and bromine react to form iodine monobromide, IBr. I2(g) + Br2(g) __ 2IBr(g) At 250°C, an equilibrium mixture in a 2.0 L flask contained 0.024
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

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