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A 46.7 mL sample of a 0.557 M aqueous hydrofluoric acid solution is titrated with a 0.225 M aqueous potassium hydroxide solution. What is the pH after 76.4 mL of base have been added?
Which silver salt will precipitate first? Show calculations to support your answer. What is the concentration of Ag+ when the first precipitate begins to form?
a group 3A metal has a densityof 2.70 g/cm3 and a cubic unit cell with an edge length of 404 pm . Reaction of a 1.07cm3 chunk of the metal with an excess of hydrochloric acid gives a colorless gas that occupies 4L at 23C and a pressure of 740 mm H..
Calculate the enthalpy change for the dissolution of NH 4 NO 3 and expree your answer in units of kJ/mol.
The normal melting point of benzene is 5.5 degrees Celsius . For the process of freezing, what is the sign for each of the following
Calculate the number of ATPs generated from the metabolic oxidation of the four carbons of acetoacetyl-CoA to CO2. Now consider the homolog derived from oxidation of an odd numbered carbon chain
What is a trans fat? Why would partially hydrogenated oils contain higher amounts of trans fats than natural fats and oils? Why are saturated and trans fats considered a risk factor for cardiovascular disease?
The enthalpy change for melting ice at 0°C and constant atmospheric pressure is 6.01 kJ/mol. Calculate the quantity of energy required to melt a moderately large iceberg with a mass of 1.39 million metric tons. (A metric ton is 1000 kg.)
What is the first step in the reaction sequence of these Aldol reactions under basic conditions?
the electrode half-reactions and calculate the standard potential of the following cell: Cu / Cu2+(aq) // Mn2+(aq),H+(aq) / MnO2(s) / Pt
The rate constant (k) for a reaction was measured as a function of temperature. A plot of ln k versus 1/T (in K) is linear and has a slope of -7445 K. Calculate the activation energy for the reaction
Suppose a buffer solution is made from formic and (HCHO2) and sodium formate (NaCHO2). What is the net ionic equation for the reaction that occurs when a small amount of hydrochloric acid is added to the buffer?
For the reaction below, if the rate of apperance of Cl2 is .022M/s, what is the rate of appearance of NO
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