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A curious student who enjoys B/L A/B chemistry puts on safety glasses, obtains a beaker containing deionized water and simultaneously adds, 0.10 mol Na2O(s), 0.050 mol Na2S(s), 0.040 mol H4NHSO4(s), 0.15 mol (H4N)2SO4(s), and 0.050 mol (HO)2SO2(l) (H2SO4). The student then adds more water until the solution volume becomes 1.0 L. Now tackle the following.
a. Write the eqn for each large-extent B/L A/B rxn which occurred on making this mixture. Do this by starting with the rxn that involves the strongest B/L A with the strongest B/L B. Label this rxn (i). Continue writing eqns in this "strength order" until all eqns have been written. (Note: The correct number of eqns is >3 but < 9. Each wrong eqn counts "-2" pts!)(10)
b. Except for H2O(l), write a complete, correct quantitative PSI for the resulting system. (5)
c. Calculate [H3O+] for the resulting system. Show all pertinent work except arithmetic. (Note: The system has a pH somewhere within 8.00 - 10.00.)
The running engine of an automobile preoduces carbon monoxide Co, a toxic gas at the rate is of about 0.117 mol CO per minute. A car is left idling in a poorly ventilated garage that is 6.0m long 4.0m wide and 2.2 m hight and 20.0 C.
The heat of solution of ammonium chloride is 15.2 kJ/mol. If a 6.253 g sample of NH4Cl is added to 65.0 mL of water in a calorimeter at 26.9°C.
When a 2.047-g sample that contains only carbon, hydrogen, and oxygen burns in excess O2, the products are 3.80 g CO2 and 1.04g H20. What is the empirical formula of this compound
The following oxidation/reduction reaction of copper and tin has an equilibrium constant equal to 1.48 at 300 Kelvin. At this temperature the equilibrium concentrations are measured to be [Sn^2+]=0.124 M, [Cu+]=0.148 M and [Sn^4+]=0.176.
The reaction 2NO(g) + Cl2 (g) --> 2NOCl(g) is carried out in a closed vessel. If the partial pressure of {NO} is decreasing at the rate of 27 torr/min, what is the rate of change of the total pressure of the vessel?
The element lithium has two naturally occurring isotopes, 7Li (isotopic mass 7.0160 amu, abundance 92.5 %) and 6Li (isotopic mass 6.0151 amu, abundance 7.50 %). Calculate the atomic mass of lithium.
Calculate the density of a block.
What is the subshell corresponding to the following sets of quantum numbers. An example of a subshell is 2s. A) n=3,l=2 b) n=3, l=1
Which of the following salts will make an ACIDIC solution when dissolved in water. a. NH4Cl b. Al(NO3)3 c. K2CO3 d. NaF Which of the following salts will make a BASIC solution when dissolved in water. a. NaHS b. Cu(NO3)2 c. KHCO3 d. NaF
Calculate the ionic strength of 100 mM solution of Mg3(PO4)2 in acetic buffer 100 mM acetic acid
Compute pH and [OH-] for each of the following solutions. (a) 8.1×10-2M Na2CO3, (b) 0.15M NaCN
What mass of sucrose should be combined with 549 g of water to make a solution with an osmotic pressure of 9.00 atm at 280 K? (Assume the density of the solution to be equal to the density of the solvent.)
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