A 5mL blood sample is treated with trichloroacetic acid for protein precipitation. After centrifugation, the remaining solution is taken to pH 3 and extracted with two portions of 5.00 mL methyl isobutyl ketone, containing APCD. The extract is aspirated directly into a air/acetylene flame and an absorbance of 0.502 at 283.3 nm is obtained. 5.00 mL aliquots of primary standard containing 0.400 y 0.600 ppm of lead are treated the same way, and absorbances of 0.396 y 0.599, respectively, are obtained. Determine the concentration of lead in the sample (in ppm) assuming it follows Beer's law.

For a 0.0301 M aqueous solution of aniline, C₆H₅NH₂ (K_b = 7.4E-10), determine the following. K_w = 1.0E-14.

What are the major and minor species present? Include phase.

What is the major species (other than water)?

What is the minor species (other than H3O+ and OH-)?

What is the concentration of the minor species in the solution? (M)

What is the concentration of the major species in the solution? (M)

What is the concentration of H₃O⁺ in the solution? (M)

What is the concentration of OH^- in the solution? (M)

Find the pH.

Methane (CH4) gas flows into a combustion chamber at a rate of 200 L/min at 1.50 atm and ambient temperature. Air is added to the chamber at 1.00 atm and the same temperature, and the gases are ignited.

a. To ensure complete combustion of CH4 to CO2(g) and H2O(g), three times as much oxygen as is necessary is reacted. Assuming air is 21 mole percent O2 and 79 mole percent N2, calculate the flow rate of air necessary to deliver the required amount of oxygen.

b. Under the conditions in part a, combustion of methane was not complete as a mixture of CO2(g) and CO(g) was produced. It was determined that 95.0% of the carbon in the exhaust gas was present in CO2. The remained was present as carbon in CO. Calculate the composition of the exhaust gas in terms of mole fraction of CO, CO2, O2, N2 and H2O. Assume CH4 is completely reacted and N2 is unreacted.

21. Assume that spherical particles with diameter=100 μm and density=1.1 g/cm3 have sedimentation velocity of 1 cm/min in a solution with density=1 g/cm3. What is the sedimentation velocity of spherical particles with diameter=50 μm and density=1.3 g/cm3 in the same conditions?

I have having trouble with data table 4 and i would like someone to double check my work on the other tables.

NaHCO3(s) + HC2H3O2(aq) → C2H3O2Na(aq) +H2CO3(aq) H2CO3(aq)→ H2O(l) +CO2(g)

Note: 5 mL of 5% vinegar contains 0.25 mL of HC₂H₃O₂ with a density of 1.0 g/mL which equals 0.25 g HC₂H₃O₂.

Data Table 4

                          Limiting Reactant            Theoretical yield of CO₂(moles)    Theoretical yield of CO₂(g)

Reaction 1        NaHCO₂

Reaction 2        NaHCO₂

Reaction 3       HC₂H₃O₂

Reaction 4        HC₂H₃O₂

_{Data Table 2}

                          Volume of 5%            Mass of HC₂H₃O₂                                            Moles of HC₂H₃O₂

                          Vinegar (mL)

Reaction 1        5.0                                        0.10                                                      0.004

Reaction 2        5.0                                        0.20                                                      0.004

Reaction 3       5.0                                        0.35                                                     0.004

Reaction 4        5.0                                        0.50                                                     0.004

Data Table 1

  Mass of NaHCO₃(g)                        Moles of NaHCO₃

Reaction 1     0.10                                                      0.001

Reaction 2     0.20                                                      0.002

Reaction 3    0.35                                                     0.004

Reaction 4    0.50                                                     0.005

Calculate the molarity of each of the following solutions.

Part A

4.15 mol of LiCl in 2.70 L solution

Part B

26.13 g C6H12O6 in 1.09 L of solution

Part C

31.0 mg NaCl in 124.5 mL of solution

1) how many valence electron are in the electron-dot structure of H2O
2) in a molecule with covalent bonding
3) which of the following polyatomic ions has a 3-ionic charge
4) Fe2(SO4)3 is called
5) the name of the HSO4-ion is
6) a group of covalently bonded atoms that has an overall electrical charge is called an
7) what is the correct formula for iron (iii) sulfide

You Receive a 1.5 mL vial of a 12.5 kDa protein that has a concentration of 1.45 mM. When you test its OD280 in a 1cm cuvette, it is 8.434.

How much total protein, in mg, do you have?

A) 0.027 B) 27.2 C) 27187 D) 15.8 E) 158137

1). A solution contains 0.0490 M Ca²⁺ and 0.0980 M Ag⁺. If solid Na₃PO₄ is added to this mixture, which of the phosphate species would precipitate out of solution first? (which one?)

(a). Ca₃(PO₄)₂

(b). Ag₃PO₄

(c). Na₃PO₄

_2). When the second cation just starts to precipitate, what percentage of the first cation remains in solution?

percentage = ?%

Classify each of the following reactions as one of these four types: • spontaneous at all temperatures • not spontaneous at any temperature • spontaneous below a certain temperature but not above • spontaneous above a certain temperature but not below See Table 17.1 in Tro, Fridgen and Shaw. (a) CO (g) + 3 H2 (g) → CH4 (g) + H2O (g); ∆H = -206.1 kJ; ∆S = -214.6 J/K (b) AgClO3 (s) + CH4 (g) → AgCl (s) + 2 H2O (g) + CO (g); ∆H = -616 kJ; ∆S = 343 J/K (c) CaS (s) + H2S (g) → CaH2 (s) + 2 S (s); ∆H = 317 kJ; ∆S = -157 J/K (d) 2 NH3 (g) → N2 (g) + 3 H2 (g); ∆H = 92.2 kJ; ∆S = 198.8 J/K

What is your opinion about:

1 Releasing the results of a research to the public is considered a good practice. Different views (or criticism) may bring valuable insight to the researchers and perhaps help them to reevaluate their findings.

2 When it comes to publishing research results to the general public, science as a whole should be inclusive in nature. Granted many research projects are funded through public means, the scientist who conduct the research often directly serve the public interest.

200 words each question no plagiarism please

If the density of water is 1g/mL and the density of a 0.16 M HCl solution is 1.023 g/mL, how do I use this information to determine the mass of both water and HCl in one liter of the solution?

***Cancel this question! I figured it out!

Hess's Law:
Calculate ΔH for the neutralization of HCl_(aq) by NaOH_(s). I'M NOT SURE WHAT DATA YOU NEED, SO I COPY AND PASTED ALL OF MY DATA.

A. ΔH_solution of NaOH_(s) Phase Change:
Mass of NaOH: 2.05 g
ΔT for reaction A : 8.0 °C

B. ΔH_solution for neutralization of HCl_(aq) and NaOH_(aq):
Volume of HCl: 0.0500 L
Volume of NaOH: 0.0500 L
Volume total: 0.100 L
Molarity of HCl: 1.95 M
Molarity of NaOH: 1.95 M
ΔT for reaction B: 11.0°C

C. ΔH for Reaction of HCl_(aq) and NaOH_(s):
Volume of HCl: 0.0550 L
Volume of water: 0.0450 L
Volume total: 0.100 L
Molarity of HCl: 1.95 M
Mass of NaOH: 3.44 g
ΔT for reaction C: 17°C

D. ΔH for Solution of KCl_(s) in water:
ΔT for reaction D: -5.0°C
Mass of KCl: 5.02 g
Volume of water: 0.0500 L

In the following reaction what mass of Ba(NO3)2 can be formed by combining 55.0g BaCO3 and 55.0g HNO3? BaCO3+2HNO3=Ba(NO3)2+CO2 +H2O