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A) For the vaporization of benzene, Delta Hvap= 30.7 KJ/ mol and Delta Svap = 87.0 J(K*mol). Calculate Delta Ssurr and Delta Stotal at 70 degree.
B) Does benzene boil at 70 degree and 1 atm pressure? Calculate the normal boiling point of benzene.
An experiment shows that a 115 mL gas sample has a mass of 0.169 g at a pressure of 699 mmHg and a temperature of 31C.What is the molar mass of the gas?
Nitrogen gas has a Henry's law constant k = 6.3 × 10-4 M/atm at 25°C. The "bends" in divers results from bubbles of N2(g) being rapidly released from body fluids when a diver ascends to the surface too quickly.
The below table lists pressure and volume measurements for air in a cylindrical piston of an air compressor. The variables may be assumed related
A 75 mL solution of 0.030 M Ca(OH)2 is titrated with 0.035 M HCl. Calculate the pH of the mixture after 60 mL of HCl have been added.
a) What is the structure of biacetyl? b) Indicate the hybridization of each carbon atom. c) How many pi bonds are present? d) Do the four carbon atoms lie in a plane or do they lie in a straight line?
If the final solution has a bromide ion concentration of 1.26 M, what was the concentration of the SrBr2 solution? (the volumes are additive) I dont understand how to write the reaction
(a) Calculate the standard molar enthalpy change (deltaHrxn°) at 400 K (not 298 K) for the following reaction (the cyclotrimerization of ethyne to benzene)
Hard water contains Ca2+, Mg 2+, and Fe2+. Water softeners replace these ions with Na+. If 1.0 X 10^3L of hard water contains 0.010 M Ca2+ and 0.0050 M Mg2+
Compute the amount of heat needed to completely sublime 43.0 grams of solid dry ice at its sublimation temperature. (The heat of sublimation for carbon dioxide =32.3).
A gas occupies a volume of 1.0 L at a temperature of 27°C and 500 torr pressure. calculate the volume of the gas if the temperature is changed to 60°C and the pressure to 700 torr
Assume that the volume of Earth's oceans is 137 x 10^7 km^3 and that the density of seawater is 1.03 g/cm^3. Also assume that the heat capacity of seawater is the same as that of water.
The product of the complete hydrolysis contained 1.8 mg of the compound shown below, and no other 2,4-dinitrophenyl derivatives of the ?-amino groups of other amino acids could be found How many polypeptide chains are in this protein?
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