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Ethanol (C2H5OH) has a normal boiling point of 78.4 OC. Estimate ?Suniverse at this 50.0 OC for the process: C2H5OH (l) ? C2H5OH (g).
Confirm whether an acid base reaction occurred stoichiometrically. The concentration of concentrated nitric acid is 15.8 M. For full credit show all calculations.
element z has two isotopes: one has mass number of 19.0 amu is 55.0% abundant,and the isotope with mass number 21.0 amu is 45.0% abundant. what is the average atomic mass for element Z?
Considering the reactions, Al + H2O, Al + NaOH, and Al + HCL, suggest a possible test to confirm the formation of ONE product in any one reaction.
A mixture of Ar and N2 gases has a density of 1.439 g/L at STP. What is the mole fraction of each gas. Express your answers using four significant figures. Enter your answers numerically separated by a comma.
For the cell reaction Cu(s) + 2Fe3+ ----> 2Fe2+ + Cu2+ Ecell=0.33V What is the value of the equilibrium constant at 25C for the cell reaction. Either 0.33, 3.82x10^5 or 1.46x10^11
Consider the following reaction at equilibrium. What affect will adding more SO3 have on the system?
A 15.8 g sample of a nonelectrolyte was dissolved is 104.0 g of water. The solution's freezing point was -1.9°C. What is the molar mass of the unknown compound?
laws of thermodynamics. Why is there no law for the conservation of entropy?
What is the pH of a buffer solution that is 0.255 M in lactic acid and 0.333 M in sodium lactate? The Ka of lactic acid is 1.4 × 10-4.
Describe how you would seperate a mixture containing acid and benzophenone (a neutral substance). Both compounds are insoluble in water and soluble in diethly ether.
A 4.305-gram sample of a nonelectrolyte is dissolved in 105 grams of water. The solution freezes at -1.23°C. Calculate the molecular weight of the solute. Kf for water = 1.86°C/m.
(Neglect volume changes.) [PO43-] = M. (b) Which cation precipitates first? Ag+ Cu2+ (c) What is the concentration of PO43- when the second cation begins to precipitate? [PO43-] = M.
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