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1) How much NaOH would you need to dissolve in water in order to prepare 1.50 L of a NaOH solution in which [OH-]=0.65 M?
2) The venom of biting ants contains formic acid, HCOOH (Ka=1.80*10^-4 at 25 C). What is the pH of a 0.0065 M solution of formic acid?
A 1L steel tank has a safety valve that opens when the internal pressure exceeds 850 torr. The tank is filled with He at 23 oC and 0.991 atm.
Draw a graph that shows the relative energy of the conformer as a function of the torsional angle. Make sure that you clearly label which conformer corresponds to which position on the graph
A 9m^3 room contains a canister of CO2 with a faulty valve. At a level of 75 mole % CO2, breathing the air becomes lethal. The room temperature is 25 degrees Celcius.
What is a specific example that exists for each of these chemical reaction types above and why might it be of importance to healthcare professionals?
A 27.0-gram sample of an unknown hydrocarbon was burned in excess oxygen to form 88.0 grams of carbon dioxide and 27.0 grams of water. What is a possible molecular formula of the hydrocarbon?
A 31.43 ml volume of .108M NaOH is require to reach the phenolphthalein endpoint in the titration of a 4.441g sample of vinegar. Calcute the percent acetic acid in the vinegar.
The enthalpy of formation of ethanol, C2H5OH, is 277.o kJ/mol at 298.15K. Calculate the enthalpy of combustion of one mole of ethanol, assuming that the products are CO2 and H2O.
solution of unknown weak acid is combined with 70 ml of a .25 M strong base, and the final pH of the solution is measured to be 2.99. What is the pKa of the unknown acid?
Acrylonitrile, C3H3N (53.07 g/mol), is used in the synthesis of a variety of plastics. What mass of acrylonitrile can be produced from a mixtur.
redraw it as a zwiterrion a neutral molecule with a positive and a negative electrical charge (n.b. not dipoles) at different locations within that molecule.
The density of the hydrogen peroxide solution is 1.01 g/ml and the solution contains 3.40% H2O2 by mass. The vapor pressure of water at 24 celsius is 22mmHg. Based on this data and information calculate the molar volume at STP.
At pH 6.00 and pE 2.10, what is the concentration of Fe2+ (mol/L) in equilibrium with Fe(OH)3?
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