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Unit Cell

Q. What is the coordination number in a body centered cubic unit cell? 14 2 12 4 8

Solved • Dec 11, 2019

Gibbs Free Energy

Q. The pH (sometimes called “pD”) of heavy water D2O at 25C is 7.43. Using this value, determine the ΔG° fo the autoionization of heavy water, and compare your value to that of pure water at 25°C. There is a significant difference in the dissociation energies of OH and OD bonds due to the quantum mechanical nature of bond vibrations, with the dissociation energy of an OD bond being approximately 6 kJ/mol greater than that of an OH bond. Is this the correct order of magnitude to explain the difference in the ΔG° values you calculated for the autoionization of H2O and D2O? This is a follow problem to the question I posted earlier. I would really appreciate a step by step explanation!

Solved • Dec 12, 2019

Heating and Cooling Curves

Q. Using the provided data, calculate the amount of heat, in kJ, that must be removed to cool 19.1 g of gaseous methanol, initially at 76. °C, to solid methanol at -119. °C. methanol molar mass 32.0419 g/mol melting point -97. °C boiling point 65. °C ΔHfus 2.2 kJ/mol ΔHvap at bp 35.2 kJ/mol Cs, solid 3.28 J/g⋅°C Cs, liquid 2.53 J/g⋅°C Cs, gas 1.5 J/g⋅°C

Solved • Dec 11, 2019

The Ideal Gas Law

Q. Consider two flasks at 25°C, one contains an ideal gas and the other contains the real gas SO3. Which statement regarding these gases is true? a. As the temperature approaches 0 K, the volume of the ideal gas will be smaller than the volume of SO3 because ideal gases have larger values of the van der Waals coefficient a. b. As the temperature is decreased, the ideal gas will liquefy first because ideal gases have larger values of the van der Waals coefficient b. c. After the temperature is increased about 100 K, the pressure of the ideal gas will be smaller than the pressure of SO3 because the van der Waals coefficient a for SO3 is large. d. After the temperature has been lowered about 100 K, the pressure of the ideal gas will be smaller than the pressure of SO3 because the van der Waals coefficient a for SO3 is large. e. As the temperature approaches 0 K, the volume of the ideal gas will be larger than the volume of SO3 because ideal gases lack intermolecular forces.

Solved • Dec 11, 2019

Weak Acids

Q. What is the pH of 12.34 mL of a 0.1315 M solution of a weak monoprotic acid (HA, Ka = 1.47 x 10-6) prior to its titration with 0.1641 M Sr(OH)2?

Solved • Dec 11, 2019

Weak Acid Strong Base Titrations

Q. What is the pH of 32.91 mL of a 0.1972 M solution of a weak monoprotic acid (HA, Ka = 6.32 x 10-7) that has been titrated with 4.22 mL of 0.1481 M LiOH?

Solved • Dec 11, 2019

Gibbs Free Energy

Q. Combining free energy equilibrium and water auto-ionization. In our treatment of acid-base equilibria we have used the value of the autoionization constant of water Kw = 1.0 x 10^-14, which is appropriate at 25°C. However, this value varies with temperature and is different for deuterated of “heavy water” D2O. In this problem, you will use thermodynamics to explore these differences. Thermochemical Information at 298 K. Using the above data, determine the pH of pure water at the boiling point 100°C, and compare your value to the pH of pure water at 25C. How does this change relate to Le Chatelier’s Principle? I don't understand what is circled in red. I didn't know there was a direct relationship between Kw and e??

Solved • Dec 11, 2019