From the standard reduction potentials in Table 11.1 in the Appendix, calculate the standard cell potential and the equilibrium constant at 298.15 K for the following reactions:

(a) 4 NiOOH(s) + 2 H2O(l) ↔ 4 Ni(OH)2(s) + O2(g)

(b) 4 NO3 - (aq) + 4 H+ (aq) ↔ 4 NO(g) + 2 H2O (l) + 3 O2(g)

You are preparing triphenyl carbinol by a grginard synthesis. First you prepare methyl benzoate, and set aside 4.40 grams of the purified ester for later use. You then prepare the grignard reagent ( phenylmagnesium bromide ) by reacting 1.78 grams of magnesium with 12.01 ml of bromobenzene. You add the 4.40 grams of methyl benzoate to the freshly prepared grignard reagent to form an addition product. Finally, after hydrolyzing the grignard addition product, you obtain 5.27 grams of the final product, triphenyl carbinol. What is the percent yield of triphenyl carbinol ? ( The density of bromobenzene is 1.495 g/ml ) (molecular weights: bromobenzene = 157, methyl benzoate=136, magnesium =24.3, triphenyl carbinol =260)

1. The coordination number of a metal atom in a close-packed structure is?

2. The coordination number of a metal atom in a BCC structure is?

3. The coordination number of an atom in the diamond or zinc blende structure is?

4. Metallic hydrogen is a proposed high pressure state of hydrogen with exciting electrical properties. Calculations have been used to propose that this material will have a low coordination number. Of the three cubic structures we have discussed, body centered cubic is the most reasonable.

True or False?

Explain the relationship between light absorbance and solution concentration for a solution which obeys the Beer-Lambert law.

What is the pH of the solution made by mixing 0.2 mol NaH2PO4 and 0.5 mol NaOH with water to make 1.00 L of solution? The pKa values for H3PO4 are 2.12 7.20 and 12.

4) Formic acid (

What is the pH p H change of a 0.200 M M solution of citric acid (pKa=4.77 p K a = 4.77 ) if citrate is added to a concentration of 0.140 M M with no change in volume?

Calculate the enthalpy of oxidation per mole for N₂ and for C₂H₂ (the enthalpy of formation of N₂O₅(g) is 11.30 kJ/mol).

Two proteins with totally different primary structures are capable of binding calcium ions with very high affinity and selectivity. Give an explanation as to why two such proteins, with very different primary structures, would have this capability in common.

(a) Let us consider CH4 combustion in air with an equivalence ratio of 0.9, where we have air flow rate of 400 kg/s. (1) calculate the required flow rate of CH4 (in kg/s), the air-to-fuel ratio on mole basis, and the mole and mass fractions of CO2, H2O, O2, N2 in the product stream. (2) If reactants enter the combustion chamber at 790K, and the products are found to leave the chamber at 1900K, calculate the net heat loss from the combustion chamber. Use constant properties. For all product constituents, use properties near the average temperature of 1345K. (b) Through web search, write down the adiabatic flame temperatures for combustion in air with all reactants at STP, for methane, and hydrogen.

Design a protocol with a list of glassware needed and calculations to prepare a 100-mL homogeneous solution of HCl/FeCl3 with 0.025 M of FeCl3 and 0.10 M of HCL.

The following reagants are available:

3 M HCl and Solid FeCl3 . 6 H2O

Determine the percent yield for an acid/base reaction that involves mixing 500. mL of 0.100 molar nitric acid with 500. mL of 0.0500 molar barium hydroxide and a 0.00200 molar solution of barium nitrate is produced.

Using standard reduction potentials, calculate the standard emf, free energy, and equilibrium constant at 298K for each of the following reactions:

a. Cl2(g) + 2 I-(aq) → 2 Cl-(aq) + I2(s)

b. 2 NO3-(aq) + 8 H+(aq) 3 Cu(s) → 2 NO(g) + 4 H2O(l) + 3 Cu2+(aq)

c. Fe(s) + 2 Fe3+(aq) → 3 Fe2+(aq)

Ive posted this twice already and the answers have been really inconsistant

A 4.10 −g sample of a mixture of CaO and BaO is placed in a 1.00-L vessel containing CO2 gas at a pressure of 735 torr and a temperature of 26 ∘C. The CO2 reacts with the CaO and BaO, forming CaCO3 and BaCO3. When the reaction is complete, the pressure of the remaining CO2 is 155 torr .

Calculate the number of moles of CO2 that have reacted.

Calculate the mass percentage of CaO in the mixture.