1.How many coulombs are required to produce 47.9 g of cobalt metal from a solution of aqueous cobalt (III)chloride Use scientific (E) notation with 2 numbers after the decimal point.

2.How many grams of chromium may be formed by the passage of 95,469 C through an electrolytic cell that contains an aqueous Cr(IV) salt.

3.What product(s) forms at the anode in the electrolysis of an aqueous solution of SnSO₄?

aluminum sulfide and water react to form aluminum hydroxide and hydrogen sulfide gas. suppose 128.00 g of aluminum are added to 154.45 mL of water(d=1.00 g/ml). Answer the following questions.

a).before the reaction, how many water molecules are present in the reaction mixture?

b) when the reaction is finished. what mass, in g, of aluminum hydroxide can theoretically be produced?

c) limiting reactant?

d) mass in grams of remaining excessreactant if the theoretical yield of aluminum hydroxide is obtained?

e)if the percent yield is 87.6% under these conditions what is the actual yiel of product aluminum hydroxide?

please show how you solve

12. Calculate the pH of a 0.10 M solution of potassium formate, KHCOO. Ka of formic acid (HCOOH) = 1.8 x 10^-4. Write the dissociation equation and label each ion as acidic, basic, or neutral. Also write the hydrolysis equation.

Dissociation equation: _____________________________________ cation: __________ anion: __________

Hydrolysis equation: _________________________________________________________________________

10. (9 pt) What reagents and collisions are needed to complete the following reaction? Give a complete mechanism, and use a free energy reaction coordinate diagram to show WHY the desired product is formed rather than other potential products. Are you using kinetic or thermodynamic control?

2,3-diethyl-1,3-butadiene -> racemic mixture of R and S versions of 3-bromo-2-ethyl-3-methyl-1-pentene

One liter of a 0.1M Tris buffer (pKa=8.3) is adjusted to a pH of 2.0. A) What are the concentrations of the conjugate base and weak acid at this pH? B) What is the pH when 1.5mL of 3.0M HCl is added to this buffer? Is Tris a good buffer at this pH? Why? C) What is the pH when 1.5mL of 3.0M NaOH is added to this buffer?

At a particular temperature the equilibrium constant for the reaction: H2(g) + F2(g) ⇔ 2HF(g) is K = 25.0. A reaction mixture in a 10.00-L flask contains 0.33 moles each of hydrogen and fluorine gases plus 0.30 moles of HF. What will be the concentration of H2 when this mixture reaches equilibrium?

A gas containing nitrogen, benzene, and toluene is in equilibrium with a liquid mixture of 30.0 mole% benzene–70.0 mole% toluene at 50.0°C and 15.0 atm. Estimate the gas-phase composition (mole fractions using Raoult's law).

3. a. Classify the following minerals:CaZrO3, FeCr2O4, SrTiO3, ZnAl2O4; as spinels or perovskites. Show how you came to this classification.

b. Describe the important electrical and/or magnetic properties of spinels, perovskites and non-stoichiometric oxides. (Note: if you quote directly from the textbook or other source please use an appropriate citation).

Question

25.0 mL of ethanol (density = 0.789 g/mL) initially at 7.0 C is mixed with 35.0 mL of water (density = 1.0 g/mL) initially at 25.3 C in an insulated beaker. Assuming that no heat is lost, what is the final temperature of the mixture?

please explain equation step by step I am confused and thank you in advance (my professor isn't helpful )

EXPERIMENT #6 DETERMINATION OF THE CONCENTRATION OF TARTARIC ACID IN WINE

1. Why must the sodium hydroxide concentration be reported to four significant figures? Why not use only two significant figures?

2. In the procedure, you added approximately 15 mL of water to each Erlenmeyer flask. Why did the exact volume of water not matter? What impact would accidentally adding 17 mL of water have on the results? Be prepared to explain.

3. Explain the significance of the value for relative standard deviation in the context of this experiment.

4. Explain the significance of the value for percent error in the context of this experiment.

5. The stoichiometric ratio in this experiment is 1:2. Determine how the calculation set-ups would change for the reaction between:

HNO3 (aq) + NaOH (aq) = H2O (l) + NaNO3 (aq) OR

H3C5H5O6 (aq) + 3 NaOH (aq) = 3 H2O (l) + Na3C5H5O6 (aq)

How many grams of silver are formed when 2.0 g of tin react with 15 mL of 1.0 M silver nitrate solution?

CHROMATOGRAPHY

In running a TLC analysis of ferrocene and acetylferrocene, the two substances were analyzed on a TLC plate in 3 different solvents (1:1 petroleum ether/diethylether, and petroleum ether and diethylether, respectively). What would be some clues that the samples of ferrocene and acetylferrocene being used in this analysis were impure?

A scientist measures the standard enthalpy change for the following reaction to be -613.2 kJ :

P₄O₁₀(s) + 6 H₂O(l)-->4H₃PO₄(aq)

Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of H₃PO₄(aq) is kJ/mol.

How many milliliters of water vapor, H₂O_(g), measured at 318 ^oC and 735 torr, are formed when 33.6 mL of NH₃ at 825 torr and 127 ^oC reacts with oxygen according to the following equation:

4NH_3(g) + 3O_2(g) --> 2N_2(g) + 6H₂O_(g)

1.50L reaction vessel was initially filled with 0.150moles of CO and 0.300moles of H2. After equilibrium is established, the vessel is found to contain 0.119moles of CO. What is the equilibrium constant for this reaction? The reaction is: CO(g) + 2H2(g) ↔ CH3OH(g)