If a 50% toluene and 50% cyclohexane mixture goes through to vaporization-condensation processes, what is the composition now?

based on a distillation lab

The reaction CH₄(g) + 2 H₂S(g) ↔ CS₂(g) + 4 H₂(g) has an equilibrium constant of 2.73 at a specific temperature. The initial concentrations of the reactants and products are [CH₄] = [CS₂] = 0.200 M and [H₂S] = [H₂] = 0.600 M. What is the equilibrium concentration of the H₂ if, at equilibrium, [CH₄] = 0.150 M?

The Ka of a monoprotic weak acid is 6.55 × 10-3. What is the percent ionization of a 0.176 M solution of this acid?

a chemical engineer places 2.12 mol Ar, 1.37 mol N2 and 0.419 mol Kr in a 6.00 L piton-cylinder assemply at 25C and 0.825 atm. what is the partial pressure of Ar

6)Draw perspective formulas for the acetonide formed from the meso and racemic hydrobenzoin (use models or PC Spartan if necessary to visualize these compounds).

7)Based on your structures in question 6.

a)How many H NMR signals should be observed for the benzyl hydrogens for the meso and racemic acetonide? Explain your answer

b)How many H NMR signals should be observed for the methyl groups for the meso and racemic acetonide? Explain your answer.

c)Explain how H NMR can be used to establish the stereochemistry of the hydrobenzoin (meso or racemic) - formed in the reduction of benzil with NaBH₄.

When baking eggs, which has a bigger impact on the brittleness of the shell of the egg-an electric oven which has drier air or a gas oven and why?

expression of schottky defects in a TiO2 crystal

The solubility-product constant for K2PdCl6 is 6.0x10^-6 (K2PdCl6(s) ----->2K+ + PdCl6(2-). What is the K+ concentration of a solution prepared by mixing 50.00 mL of 0.200 M KCl with 50.00 mL of

a) 0.0800 PdCl6(2-)M?

b) 0.170 PdCl6(2-)M?

c) 0.260 PdCl6(2-)M?

which one is more easily oxidized.

Copper or hydrogen

Iron or Hydrogen

Magnesium or Hydrogen

Zinc or hydrogen

list the element in the most easily oxidized to the least easily oxidized.

Calcium, cesium, copper, hydrogen, iron, magnesium ,sodium and zinc

Dichloroethane C₂H₄Cl₂ is a common industrial solvent. underground behind an abandoned plant a 700m³ volume of soil is found to be contaminated with this chemical to an average concentration of 50 ppm. a survey of the soil indicates that ample bacteria are present to decompose the waste according to the following equation:

2C₂H₄Cl₂ + 5O₂ ---> 4CO₂ + 4HCl + 2H₂O

Presently, however, there is insufficient oxygen available to the microorganisms, and therefore you decide to pump water containing 8 ppm O₂ into the site at a rate of 50L/min. Assume that both the bacteria and dichloroethane are adsorbed irreversibly to the soil. Also assume that 10% of the supplied oxygen is used by bacteria to degrade dichloroethane according to the above equation, while the remaining 90% wasted to the soil or to the other microbial processes. How much time is required for the average concentration of C₂H₄Cl_{2 at the site to fall to 10 ppm?}

Construct the titration curve, for the titration of 50.0 mL of 0.125 M trimethylamine with 0.175 M HCl (aq). (Use graph paper and show all your work for full CREDIT)

Calculate the initial pH of the solution in the flask?

Calculate the pH of the solution mixture after 15 mL of titrant is added?

Calculate the pH at the equivalence volume?

Calculate the pH at of the mixture after 45 mL of titrant is added?

Calculate the pH of the mixture after 60 mL of titrant is added?

1). Nitromethane (CH3NO2) burns in air to produce significant amounts of heat. 2CH3NO2(l)+3/2O2(g)→2CO2(g)+3H2O(g)+N2(g) ΔH∘rxn=−1418kJ How much heat is produced by the complete reaction of 6.91 kg of nitromethane?

2). The air within a cylinder equipped with a piston absorbs 529 J of heat and expands from an initial volume of 0.10 L to a final volume of 0.87 Against an external pressure of 1.0 atm. What is the change in internal energy of the air within the cylinder?

3). The propane fuel (C3H8) used in gas barbeques burns according to this thermochemical equation. C3H8(g)+5O2(g)→3CO2(g)+4H2O(g)ΔH∘rxn=−2044kJ​ If a pork roast must absorb 1.7×103 kJ to fully cook, and if only 13 % of the heat produced by the barbeque is actually absorbed by the roast, what mass of CO2 is emitted into the atmosphere during the grilling of the pork roast?

4). How much heat is required to warm 1.40 L of water from 20.0 ∘C to 100.0∘C? (Assume a density of 1.0g/mL for the water.)

Find the pH of each of the following solutions of mixtures of acids.

0.135 M in HBr and 0.120 M in HCHO2

0.155 M in HNO2 and 8.5×10⁻² M in HNO3

0.190 M in HCHO2 and 0.23 M in HC2H3O2

6.0×10⁻² M in acetic acid and 6.0×10⁻² M in hydrocyanic acid

Determine the theoretical yield in mL when 1.5 mL of 3,3-dimethyl-2-butanol and 7 drops of H2SO4 (conc) are heated together at 70 degrees C. The product will have a molecular weight of 84.16 g/mol and a density of .68 g/mL.