Using a molecular mechanics program, calculate the energy difference or the difference in heats of formation between Z- and E-stilbene. How do your computed values compare to the difference in heats of hydrogenation of the two isomers.

How is Avogadro's principle (n1/v1=n2/v2) derived from the ideal gas law. Can you show me the algebraic steps?

If hydrogen sulfide concentrations are greater than 0.15 mg S/L, it is harmful to fish health, calculate the minimum safe pH, if the total sulfide concentration is determined to be 20 micrometers. Assume this is a closed system and there is no H₂S transfer with the atmosphere. pKa₁= 7, pKa₂= 12 for H₂S. Molar mass for sulfur is 32g/mol

Describe the influences and forces driving the formation of the lipid bilayer. Briefly discuss the effect of a phase transition on a lipid bilayer

A reaction has and △H°298 = 151 kJ/mol and △S°298 = 286 J /mol K at 298 K. Calculate △G in kJ/mol.

A major organic acid in this juice is malic acid, a dicarboxylic acid with molecular weight of 134. You are asked to determine the total acidity of this juice and a 10-mL portion of this juice took 8.5 mL of 0.105 N NaOH to neutralize to the phenolphthalein endpoint. What is the acidity in mg malic acid/mL juice unit and in % (weight) unit?

Calculate the pH for each case in the titration of 50.0 mL of 0.240 M HClO(aq)0.240 M HClO(aq) with 0.240 M KOH(aq). Use the ionization constant for HClO.

What is the pH before addition of any KOH?

What is the pH after addition of 25.0 mL KOH?

What is the pH after addition of 30.0 mL KOH?

What is the pH after addition of 50.0 mL KOH?

What is the pH after addition of 60.0 mL KOH?

A 25.0 mL sample of 0.150 M potassium hydroxide is titrated with 0.125 M hydrobromic acid solution. Calculate the pH after the following volumes of acid have been added: a) 20.0 mL b) 25.0 mL c) 30.0 mL d) 35.0 mL e) 40.0 mL

Would you have affected the freezing point of water as much as you affected the freezing point of benzene? Explain using the Df for each solvent as part of your explanation.

One of Albert Einstein's contributions to nuclear chemistry was his observation that energy and what are different manifestations of the same thing?

The Solvay process involves a reaction of sodium chloride, ammonia and carbon dioxide in aqueous solution. Of the various possible products, the one least soluble in water is?

Select one alternative:

• “washing soda” (Na₂CO₃)
• "baking soda" (NaHCO₃)
• “sal ammoniac” (NH₄Cl)
• “table salt” (NaCl)
• ammonium bicarbonate

Explain how Fick

how to calculate expected pH , buffer concentration and buffer capacity?

Chemists often use molarity M, in moles/liter, to measure the concentration of solutions. Molarity is a common unit of concentration because the volume of a liquid is very easy to measure. However, the drawback of using molarity is that volume is a temperature-dependent quantity. As temperature changes, density changes, which affects volume. Volume markings for most laboratory glassware are calibrated for room temperature, about 20?C.

Fortunately, there are several other ways of expressing concentration that do not involve volume and are therefore temperature independent.

A 2.350