posted by .

(i) Explain why the freshman criterion for sponteneity: G=H-TS < 0 is just a statement of the second law of thermodynamics (that the entropy of the universe always increases).

Now apply this concept to some ice cubes sitting in a mojito, where the chemical process of interest is: H2O(s)  H2O (l)

ii) Are S and H for the system positive or negative? Explain why
iii) Explain what the relative magnitude of H/T to S is (i.e. are the terms larger, smaller or equal?) at 260K and 340K.
iv) 10g of ethanol at 290K are mixed with 10g of ethanol at 310K in an insulated beaker. Show that heat transfer from the warmer ethanol is a spontaneous process

  • chemistry -

    Look up the second law of thermodynamics, memorize it, and apply it to (i).
    (ii) What does the delta G tall you?
    (iii) Use delta G = delta H - Tdelta S

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chemistry

    We have 1 mol of N2 gas that is heated at constant pressure from 300K to 5770K on the surface of the sun. i) Find H and S given that P for nitrogen is (25.7 + 0.0130T) J/mol-K. ii) Now, redo your calculation assuming …
  2. Chemisty

    In an experiment, 23.0 g of ice at –25°C is converted into steam with a temperature of 124°C. How much heat is required for the process?
  3. Chemisty

    How much heat energy is released to surrounding when 15.0 g of water at 35°C is converted into ice with a temperature of -45°C?
  4. Chemisty

    In an experiment, 230 kJ of heat energy are released to the surroundings when steam is converted to liquid water. Calculate the number of grams of water condensed. The following data may be of use: vap = 2260 J/g; Hfus …
  5. Thermodynamics 2nd Law

    The 2nd law of thermodynamics states that “in any spontaneous process, the total entropy of the universe always increases”. Yet in biological systems there are processes where there is a decrease in entropy during a reaction. Give …
  6. Chemistry

    Which of the following is NOT a statement of the second law of thermodynamics?
  7. chem 3

    (a) If H is positive and S is negative, would G to be positive or negative or is it dependent on T?
  8. Chemistry

    16. From the standard enthalpies of formation, calculate the Horxn for the reaction: (Hof = -151.9 kJ/mol for C6H12.) C6H12(l) + 9 O2(g)  6 CO2 (g) + 6 H2O(l)
  9. chemistry

    17. Calculate H for the following reaction using Hess law H2 (g) + Br2 (g) → 2 HBr (g) Experimental information 2 H+ → H2 H -436.4 kJ 2 Br- → Br2 H -192.5 kJ 2 H+ + 2 Br- →2 HBr H …
  10. Chemistry

    Given the following information: C(s) à C(g), H = +715 kJmol-1 Cl2(g) à 2Cl(g), H = +242 kJmol-1 C(s) + 2Cl2(g) à CCl4(g), H = -135.5 kJmol-1 Calculate the average bond dissociation enthalpy of a C-Cl bond.

More Similar Questions