10.4g of Mercury(2) oxide will produce what volume of oxygen in the reaction where mercury(1) oxide and oxygen produces mercury(2) oxide

12.You have a mixture of solids in the ratio of 50:3 for A : B. You are planning to use the technique of recrystallization to purify A and realize that you will first need to determine which solvent or solvent pair would be appropriate. Describe the solubility properties of the solvent that you would want to use, briefly explaining your rationale.

An acidic buffer solution can be prepared from phosphoric acid and dihydrogen phosphate.

a. What is the pH of solution prepared by mixing 23.5g of NaH 2 PO 4 and 15.0mL of concentrated phosphoric acid (14.7M) in enough water to give 1.25L of solution?

b. By how much does the pH of this buffer solution change on the addition of 3.50 mL of 6.0M HCl?

using three enzymatic steps propose a pathway for the conversion of alpha ketoglutartate to 2-oxoadipate. Draw the missing intermediates and indicate the chemistry involved in each reaction. Include any cofactors that might be required.

You have 1 M solutions of H₃PO₄, NaH₂PO₄, Na₂HPO₄, Na₃PO₄ (no NaOH).

=> Using only two of these solutions, how would you prepare 150 mL of 1 M phosphate buffer at pH 3.0?

The combustion of liquid ethanol (c2H5OH) produces Carbon Dioxide and water. After 4.62 mL of ethanol ( density= 0.789 g/mL) was allowed to burn in the presence of 15.55 g of Oxygen gas, 3.72 mL of water (density=1.00 g/mL) was collected. Determine the limiting reactant, theoretical yield of H20, and percent yield for the reaction. (hint: write a balanced equation for the combustion for the combustion of ethanol.)

. A water solution has 1.00x10-2 moles of H+ in 10.00 liters A. What is the [H+] in the solution? B. What is the pH ? C. What is the [OH-] ions? D. Is the solution acidic or basic ? E. What is the pH if water is added to make the volume 100.0 liters?

An element crystallizes in a body-centered cubic lattice. The edge of the unit cell is 3.28 Å in length, and the density of the crystal is 6.50 g/cm3 .

a.) Calculate the atomic weight of the element.

Balance each of the following reations using the half reaction method. Show all work

a. Bi(OH)₃(S) + Sn(OH)₃^-(aq) ---> Sn(OH)₆^2- (aq) + Bi(s) (Basic solution)

b. BrO₃^-(aq) + Sb³⁺(aq) ---> Br ^- (aq) + Sb⁵⁺ (aq) (acidic solution)

Thank you for your help!

1) Zinc reacts with hydrochloric acid according to the reaction equation.How many milliliters of 4.00 M HCl(aq) are required to react with 5.85 g of an ore containing 44.0% Zn(s) by mass?

2) The amount of I3–(aq) in a solution can be determined by titration with a solution containing a known concentration of S2O32–(aq) (thiosulfate ion). The determination is based on the net ionic equation.

2SO2O3(2-)(aq) +I3(-)(aq) --->>> S4O6(2-)(aq) + 3I(-)(aq)

Given that it requires 25.6 mL of 0.460 M Na2S2O3(aq) to titrate a 10.0-mL sample of I3–(aq), calculate the molarity of I3–(aq) in the solution.

Pressurized tanks are commonly used in gas propulsion for space applications. Two rigid, insulated tanks are interconnected by a valve. Initially 0.79 kmol of nitrogen at 200 kPa and -18oC fills one tank. The other tank contains 0.21 kmol of oxygen at 100 kPa and 27oC. The valve is opened and the gases are allowed to mix until a final equilibrium state is attained. During this process, there are no heat or work interactions between the tank contents and the surroundings. Determine the following:

a. The volume of each gas

b. The final temperature of the mixture

c. The final pressure of the mixture

d. The amount of entropy produced in the mixing process

Heavy metal azides, which are salts of hydrazoic acid, HN3, are used as explosive detonators. A solution of 0.20M hydrazoic acid has a pH of 3.21. What is the Ka for hydrazoic acid?

You find two bottles of white solid on a shelf in the stock room without labels. You then find two labels CaCl2 (s) and KCl (s0 lyring right beside. You want to determine which is which. The solids can be differentiated by dissolving each solid in water and measuring the change in temperature.

delta H(f) CaCl2 (s) = -796 kJ/mol     

delta H(f) KCl (s) = -437 kJ/mol         

You dissolve 0.100 moles of unknown A in enough water to make a 200g solution at 22 degress C. The final temperature of the system is 31.7 degress C. Which solid is unknown A?         

What would be the expected Final Temperature if you dissolved 0.100 moles of unknown B in enough water to make a 200g solution at 22 degrees C?                  

Draw an enthalpy diagram for the dissolution of unknown B, be sure to include reactants, products, enthalpy, delta H, reaction progress.

Given that ΔG∘ = −13.6 kJ/mol, calculate ΔG at 25∘C for the following sets of conditions.

1) 30 atm NH3, 30 atm CO2, 4.0 M NH2CONH2 Express the free energy in kilojoules per mole to two significant figures.

2) 8.0×10−2 atm NH3, 8.0×10−2 atm CO2, 1.0 M NH2CONH2 Express the free energy in kilojoules per mole to two significant figures.

Is the reaction spontaneous for the conditions in Part A and/or Part B?

A) Is the reaction spontaneous for the conditions in Part A and/or Part B?

B) spontaneous for the conditions in both parts.

C) spontaneous for the conditions in Part but nonspontaneous for the conditions in Part B. spontaneous for the conditions in Part B but nonspontaneous for the conditions in Part A

D) nonspontaneous for the conditions in both parts.