1. Consider the phase change:
C(graphite) <---> C(diamond)
Given that delta_rG^o/Jmol^-1 = 1895 + 3.363T, calculate the enthalpy and entropy. Calculate the pressure at which diamond and graphite are in equilibrium with each other at 25 degree Celsius. Take the density of diamond and graphite to be 3.51 g/cm^3 and 2.25 g/cm^3, respectively. Assume that both diamond and graphite are in-compressible.

2. a. The vapor pressure of solid and liquidhydrogen iodide can be expressed empirically as
ln(P/torr) = -2906K/T + 19.020
and
ln(P/torr) = -2595.7K/T + 17.572
calculate the ratio of the slopes of the solid-gas curve and the liquid-gas curve at the triple point.
b. Given that the normal melting point, critical temperature, and the critical pressure of hydrogen iodide are 222K, 424 K, and 82.0 atm, respectively, use the data in part a is sketch the phase diagram of hydrogen iodide.

Solution Summary

The enthalpy and entropy are calculated for T-dependent equations. The ratio of slopes from Clausiuis-Clayperon equations and phase diagrams are explained.

1. Give an example of a linear function and show at least one method of graphing it. By looking at the graph of a line, how can you tell if its slope is negative? What kind of line has a slope of zero and why?
2. Give an example of quadratic function and show at least one method of graphing it

The reaction of 4.49 g of carbon and 9.21 g of oxygen, produced carbon dioxide, and 113.2 kJ of heat. What is the enthalpy of formation of carbon dioxide?

Calculate the enthalpy change for the reaction
P4O6+2O2 --> P4O10
given the following enthalpies of reaction:
P4+3O2 --> P4O6 Delta H= -1640.1
P4+5O2 --> P4O10 Delta H= -2940.1

5. C(s) + CO2(g) ---> 2 CO(g)
Carbon (graphite), carbon dioxide and carbon monoxide form an equilibrium mixture as represented by the equation above.
(a) Predict the sign for the change in entropy, deltaS, for the reaction. Justify your prediction.
(b) In the table below are data that show the percent of CO in the equi

20. The graph below displays growth of a town's population y = P(t) over the next 3 years, where t is time in months.
a. Estimate how fast the population is increasing 5 months, and 20 months from now.
b. Graph y = P'(t).
In graphs of questions 2, 4 and 6, determine which is the f(x) function and which is the derivative?

The normal boiling point of bromine is 58.8 C. Given that the vapor pressure pressure of methanol (sic) is 75.0 torr at 2.5 C, Calculate the molar enthalpy of vaporization of bromine.
Show all work and thanks for your help and time.

Could you take a look at some problems that I have answered to see if I'm in the right direction.
(a) Using this plot, estimate the enthalpyand entropy of binding for each protein to DNA.
(b) What is the free energy change for the binding of WT1 and EGR1 to DNA at 25oC?
(a) For each of the proteins: is the binding to

Look at the dissolution of various salts. Compare the dissolution of sodium hydroxide with that of sodium chloride. a) How do the energy changes for the overall processes compare?
b) Discuss the difference in magnitude of each of the three steps for dissolution of the two compounds.

1000 kg/hr of a mixture containing 42 mole percent heptane and 58 mole percent ethyl benzene is to be fractionated to a distillate containing 97 mole percent heptane and a residue containing 99 mole percent ethyl benzene using a total condenser and feed at its saturated liquid condition. The enthalpy-concentration data for the h