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

8. What is the molar fraction of benzene in a solution made by mixing 10 g of benzene (Molecular Weight 78.11) and 10 g of toluene (Molecular Weight 92.14)? Show two significant digits in your answer.

9. Radioactive Iodine-131, with a half-life of eight days, is a common fission product and thus is present in high levels in radioactive fallout. How long will it take for initial radiation intensity to drop 8-fold?

10. In an experiment, a sample was 90% decomposed in 24 min. Approximately how long would this decomposition have taken if the sample had been heated 20°C higher? (Hint: Assume the rate doubles for each 10°C rise in temperature.)

11. Find which kind of catalyst is necessary to facilitate the reaction between molecular nitrogen and molecular hydrogen to make ammonia (several words description)

Acetylsalicylic acid, C₉H₇O₂COOH, has a pK_a = 3.480. A solution was prepared by dissolving 6.20 g of acetylsalicylic acid in 1.000 L of solution.   mw = 180.16 g/mol.

A. Calculate the pH using the quadratic and the approximate approaches.

Approximate method yields pH = 2.47

Quadratic methods yields     pH = 2.49

B   Calculate the percent error introduced in the hydrogen ion concentration if the approximate solution was chosen

% error in terms of hydrogen ion concentration is 4.98%

I know the answer for B, I just don't know how to do it :(

How many moles of Al2O3 is produced from 0.32 mol Al and 0.26 mole O2? How many moles of Al2O3 are formed from the reaction of 6.38 grams of O2 and 9.15 grams of Al? How many grams of Al2O3 are formed from the reaction of 8.32x10^20 molecules of O2 and 4.26x10^21 molecules of Al? use 4Al+3O2=2Al2O3 to help.

1 a. A buffer solution is prepared by placing 5.86 grams of sodium nitrite and 32.6 mL of a 4.90 M nitrous acid solution into a 500.0 mL volumetric flask and diluting to the calibration mark. If 12.47 mL of a 1.43 M solution of potassium hydroxide is added to the buffer, what is the final pH? The K_a for nitrous acid = 4.6 X 10^-4.

1 b. A 0.892 liter buffer solution is prepared so that it is 0.430 M in benzoic acid (C₆H₅COOH) and 0.490 M in sodium benzoate (C₆H₅COONa). If you add 15.80 mL of a 2.53 M solution of nitric acid to this buffer solution, what is the final pH? The K_a for benzoic acid = 6.5 X 10^-5.

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) C2H2 (g) + 2 H2 (g) → C2H6 (g); ∆H = -311.4 kJ; ∆S = -232.7 J/K

(b) 4 Ag (s) + CO2 (g) → 2 Ag2O (s) + C (s); ∆H = 331 kJ; ∆S = -136 J/K

(c) 2 NH3 (g) → N2 (g) + 3 H2 (g); ∆H = 92.2 kJ; ∆S = 198.8 J/K

(d) 4 NaNO3 (s) + 5 C (s) → 2 Na2O (s) + 5 CO2 (g) + 2 N2 (g); ∆H = -924 kJ; ∆S = 1107 J/K

What pathways control glycogen metabolism?

Please explain fully, show diagrams if needed

Sketch two 3d-orbital energy-level diagrams for the transition metal ion in [MCl₆]^4- when elongation and compression along the z axis take place, respectively. In the diagrams, label the names of the d orbitals, e.g., d_xy, d_xz, d_yz, d_z2, and d_x2-y2.

1. What is the theoretical yield of aspirin when reacting 3.08 g of salicylic acid with an excess of acetic anhydride? Report your answer to 3 significant figures.

2. If you prepare 3.45 kg of aspirin from an industrial process with a theoretical yield of 4.38 kg of aspirin, what is the percent yield of the process? Report your answer to 3 significant figures.

3. What is the yield of aspirin when reacting excess salicylic acid with 1.11 mL of acetic anhydride? The density of acetic anhydride is 1.082 g/mL. Report your answer to 3 significant figures.

Under anaerobic conditions, glucose is broken down in muscle tissues to form lactic acid according to the reaction, C6H12O6(s) → 2CH3CHOCOOH(s). Thermodynamic data for glucose and lactic acid at 298 K are given below. ΔHfº (kJ/mol) Cp.m (J/mol∙K) Smº (J/mol∙K) Glucose −1273.1 219.3 209.2 Lactic Acid −673.6 127.6 192.1 (a) Calculate ΔS for the system, surrounding and universe at T = 325 K. Assume the heat capacities are constant between 298 K and 325 K. (b) Is this reaction spontaneous or reversible at 325 K? Explain. (c) At what temperature, will this reaction establish the equilibrium?.

In a hydrogenic atom, s- and p-type orbitals of the same shell are degenerate. Explain why the 2s and 2p
orbitals would not be degenerate in a carbon atom, and justify their relative energy ordering. (Hint: consider
the radial distribution functions for these orbitals).

Advance oil chemistry, answer in brief and correct otherwise leave!

What are the major solid effluents come from oil industries.

Summarize the different of type of indicator electrodes, their definition, characteristics and applications

________________ compounds are made up of non-metals only.