Chromatography is used in many different ways in the workplace to analyze medical, environmental, and industrial samples, for example. How does it accomplish this in terms of physical and chemical interactions?

A mixture of 0.02958 mol of O2, 0.01705 mol of NOCl, 0.03162 mol of NO2, and 0.008375 mol of Cl2 is placed in a 1.0-L steel pressure vessel at 2458 K.

The following equilibrium is established: 1 O2(g) + 2 NOCl(g) 2 NO2(g) + 1 Cl2(g)

At equilibrium 0.005233 mol of Cl2 is found in the reaction mixture.

(a) Calculate the equilibrium partial pressures of O2, NOCl, NO2, and Cl2.

Peq(O2) = .

Peq(NOCl) = .

Peq(NO2) = .

Peq(Cl2) = .

(b) Calculate KP for this reaction.

KP = .

complete combustion of a 0.30- mol sample of hydrocarbon gives 1.20 mol of CO2 and 1.50 mol of H2O. What is the molecular formula of the original hydrocarbon?

a) Calculate the potential in the following cell (no current is flowing)

Zn|Zn2+(1.00M)|| UO2 2+(1.00M), U4+ (0.1M), H3O + (1.00M) |Pt

b) The cathode has a volume of 50 mL. What is the cell potential (no current) after adding 10 mL, 25 mL, 50 mL, and 100 mL 1M NaOH to the cathode?

c) What is the Gibbs Free Energy for the 5 cells in a) and b). What is the spontaneous reaction in each case?

Calculate the ΔG°_rxn using the following information.

	4 HNO3(g)	+	5 N2H4(l)	→	7 N2(g)	+	12 H2O(l)		ΔG°rxn = ?
ΔH°f (kJ/mol)	-133.9		50.6				-285.8
S°(J/mol • K)	266.9		121.2		191.6		70.0

Consider the following reaction: CO(g)+2H2(g)⇌CH3OH(g) Kp=2.26×104 at 25 ∘C. Calculate ΔGrxn for the reaction at 25 ∘C under each of the following conditions. - standard conditions - at equilibrium - PCH3OH= 1.4 atm ; PCO=PH2= 1.5×10−2 atm

Create an ordered list of the tests you will perform on your unknown to identify its cation(Ba^{+2}, Pb^{+2}, Zn^{+2}) and anion(CO_3^{-2},SO_{4}^{-2}, PO_{4}^{-2},SCN^-, Cl^-, NO_3^-). The procedure for each test should be briefly described, along with what a positive and negative result looks like. Assume that each test returns a negative result, except for the last cation and anion test, so that you have to perform all of the tests.

Please help!

Thank you!

Determine the pH of each of the following two-component solutions.

1)4.5×10−2 M KOH and 2.5×10−2 M Ba(OH)2

2)0.265 M NH4NO3 and 0.102 M HCN

3)7.5×10−2 M RbOH and 0.120 M NaCl

4)9.2×10−2 M HClO4 and 2.2×10−2 M KOH

5)0.115 M NaClO and 5.50×10−2 M KI

C. Calculate the pH of a 0.10 M aqueous solution of the weak base ammonia, NH3 , if the degree of dissociation is 1.34%.

Determine the pH of each of the following two-component solutions.

1)4.5×10−2 M KOH and 2.5×10−2 M Ba(OH)2

2)0.265 M NH4NO3 and 0.102 M HCN

3)7.5×10−2 M RbOH and 0.120 M NaCl

4)9.2×10−2 M HClO4 and 2.2×10−2 M KOH

5)0.115 M NaClO and 5.50×10−2 M KI

How do you estimate what concentrations of ZnCl₂ will give a conductivity range of 300-2000 microseconds/cm?

If posible please explain how in detail.

Describe what happens to molecular oxygen in the upper atmosphere when exposed to radiation at λ = 1030 – 1070 Å and radiation at λ = 1027 Å.  Description should include name of the process occurring and the type products (to include charge).

A sample of solid Ca(OH)₂ was stirred in water at a certain temperature until the solution contained as much dissolved Ca(OH)₂ as it could hold. A 59.6-mL sample of this solution was withdrawn and titrated with 0.0543 M HBr. It required 67.1mL of the acid solution for neutralization.

(b) What is the solubility of Ca(OH)₂ in water, at the experimental temperature, in grams of Ca(OH)₂ per 100 mL of solution?   g/100mL

Each of the following four sets contains two electrons, each of which is defined by four quantum numbers (n, l, ml, ms). For each set, indicate whether the quantum numbers for the two electrons are valid for the two electrons in the highest energy subshell of a neutral titanium atom. If they are not valid, list the principle that the quantum numbers violate (Pauli Exclusion, Aufbau, or Hund’s Rule) and explain below.

(the numbers are shown below in the order stated below and need to be proven valid or invalid based on the rules above)

Set #: Electron 1: Electron 2: Valid or invalid?: Violation of what rule?:

1 (3, 2, +2, +½)] (4, 1, +1, +½)

2 (3, 2, +1, +½) (3, 2, +1, +½)

3 (3, 2, +2, +½) (3, 2, +1, +½)

4 (3, 2, +1, +½) (3, 2, +1, –½)