A and B are for and ideal solution. Pure A has a vapor pressure of 84.3 torr, while pure B has a vapor pressure of 41.2 torr. The mole fraction of A in the liquid phase is equal to 0.32.

a). Calculate PA,PB and Ptotal.

b). If a portion of the gas phase is removed and condensed in a seperate container, what will PA,PB, and Ptotal of the new system be?

In a lab, we are required to make a 100ml solution that contain: 54.30mg/L sodium salicylate, 0.020M FeCl3, 0.050 M HCl. I will also need to create a blank solution that contains 0.020 M FeCl3 and 0.050 M HCI. The blank solution is also 100.00 mL. At the end, we are required to get an absorbance at 520 nm. What should I do to prepare the solutions? Please give detailed instructions. Thank you very much!

(a) A standard iodine solution was standardized against a 0.4123 g primary standard As4O6 by dissolving the As4O6 in a small amount of NaOH solution, adjusting the pH to 8, and titrating, requiring 40.28 mL iodine solution. What is the concentration of the iodine solution?

As4O6 (s) + 6H2O -> 4H3AsO3

H3AsO3 +I3^- + H2O -> H3AsO4 + 3I^- + 2H^+

(b) The purity of a hydrazine (N2H4) sample is determined by titration with triiodide. A sample of the oily liquid weighting 1.4286 g is dissolved in water and diluted to 1 L in a volumetric flask. A 50.00 mL aliquot is taken with a pipette and titrated with the standard iodube solution in (a), requiring 42.41 mL. What is the percent purity by weight of the hydrazine?

N2H4 + 2I3^- -> N2 + 6I^- +4H^+

Assuming standard conditions, and considering the table of standard reduction potentials for half-reactions, given in your text, rank the following species according to their relative strength as reducing agents. For example, the most powerful reducing agent would be given rank "1", and the least "6".

Cd

Mn

H2 (acidic half-cell solution)

Na

Cl-

ClO2-

What is necessary for a bond to be considered polar?

What is necessary for a molecule to be polar?

Assume that liquid water has a temperature-independent capacity of 75 J mol^-1K^-1, and that for the transition below no heat is lost to the surroundings and the processes are reversible.

a. Calculate the chnge in entropy when 1 mol of liquid water is cooled from 100C to 50 C.

b. Calculate the change in entropy of the system when 1 mol of liquid water at 100C is brought into contact with 1 mol of liquid water at 0C.

Explain in detail the principles, mechanisms, and chemical structural features of electroconductive polymers.

When comparing two enzymes against a single substrate it is best to compare which of the following experimentally determined values?

kcat

Km

none of these

Vmax

k2

The sulfate ion level in a municipal water supply is given as 46.0ppm .

What is [SO2?4] in this water? in units M

1. A large quantity of chemical energy is stored in a gummy bear, which is primarily sugar, C12H22O11. When a gummy bear is placed in molten KClO3, the sugar is oxidized according to the following thermochemical equation: C12H22O11(s) + 8 KClO3(l) ⇒ 8 KCl(s) + 12 CO2(g) + 11 H2O(g) ∆Hrxn = −5488 kJ
If a gummy bear has an average mass of 0.5250 g and is 91.40% sugar, then how many whole gummy bears does it take to bring a cup of water (250.0 mL) at an initial temperature of 20.0°C to the boiling point? The boiling point of water is 100.0°C, the density of water (20°C) is 0.9982 g/mL, and the specific heat capacity of water is 4.184 J/(g•°C).

2. When 50.0 mL of 1.00 M Pb(NO3)2 (d = 1.30 g/mL) and 50.0 mL of 1.50 M KI (d = 1.18 g/mL) are mixed in a constant-pressure calorimeter, a precipitate forms and the temperature of the mixture increases from 19.0°C to 23.3°C.
(a) Indicate if the precipitation reaction is endothermic or exothermic.
(b) Write both the complete and net ionic chemical equations, including phase symbols, for the reaction that occurs when the two solutions are mixed.
complete:
net ionic:
(c) Calculate the moles of the limiting reactant.
(d) Calculate ∆Hrxn in kilojoules for the precipitation reaction, assuming that the heat capacity of the calorimeter is 15 J/°C in this case and the specific heat capacity of the solution after mixing is the same as that of water.

1) 65. mLs of water is added to 403 mLs of 2.39 M solution of HCl. What is the new molarity of the solution?

2) How much water must be added to 403mLs pf 2.39 M solution of HCl. What is the new molarity of the solution?

The rate consant for the reaction
I+I+Ar---->I₂+Ar
is 0.59 x 10¹⁶ cm⁶mol^-2s^-1 at 293K. What is the half-life of I is [I]_o= 2 x 10^-5 mol L^-1 and [Ar]= 5 x 10^-3 mol L^-1?

Select all of the following equations that would most likely give a positive value for ΔS. -- How do you determine the value of ΔS just by a reaction???

1. AgNO₃ (aq) + KCl (aq) → AgCl (s) + KNO₃ (aq)

2. 2 NOBr (g) → 2 NO (g) + Br₂ (g)

3. 2 Al (s) + 3 Cl₂ (g) → 2 AlCl₃ (s)

4. N₂ (g) + O₂ (g) → 2 NO (g)

5. 2 NO (g) + O₂ (g) → 2 NO₂ (g)

6. 2 NO₂ (g) → N₂O₄ (g)

7. 2 NH₃ (g) → N₂ (g) + 3 H₂ (g)

8. 2 CH₄ (g) → C₂H₄ (g) + 2 H₂ (g)

5.0 mL 1.0 M NaOAc + 28.0 mL 1.0 M HOAc

pH= 3.68

Calculations:

1. [H+] =?

2. [OAc-]=?

3. [HOAc]=?

4. Ka=?

Do the calculations for the titration of 50.00 mL of a 0.1000 M solution of H₂SO₃ with a 0.2000 M solution of NaOH. Calculate the pH after the addition of 0.00, 12.50, 25.00, 37.50, 50.00, and 60.00 mL of NaOH. Provide the answers in the blanks below. K_a1(H₂SO₃)=1.23×10^-2; K_a2(HSO₃^-)=6.60×10^-8.