HClO is a weak acid (Ka = 4.0

If the Ecell of the following cell is 0.945 V, what is the pH in the anode compartment? Pt(s) | H2 (1.00 atm) | H+(aq) || Ag+(0.100 M) | Ag(s)

1.245 is NOT the correct answer

[2] Calculate ∆H°rxn and ∆S°rxn for the following reaction and decide in which direction each of these factors will drive the reaction.

N2(g) + 3 H2(g) → 2 NH3(g)

Part A

A 75.0-mL volume of 0.200 M NH3 (Kb=1.8×10−5) is titrated with 0.500 M HNO3. Calculate the pH after the addition of 25.0 mL of HNO3.

Part B

A 52.0-mL volume of 0.35 M CH3COOH (Ka=1.8×10−5) is titrated with 0.40 M NaOH. Calculate the pH after the addition of 21.0 mL of NaOH.

Select the grouping in which all statements are TRUE regarding the rules for naming complexes:

I. The ligands are named in alphabetical order after the metal ion.

II. The isomer (e.g.,cis‐ or trans‐) is included after the listing of the ligands of the complex.

III. The complex [Cr(en)3] 3+ would be named Δ‐ or Λ‐tris(ethylenediamine)chromium(III) depending on the arrangement of the en ligands and the rotation of polarized light.

IV. Cis‐diaminodichloroplatinum(II) and trans‐diaminodichloroplatinum(II) are possible names for Pt(NH3)2 Cl2.

V. The correct name for the complex [Tc(NMe3)6] 3+ is hexa(trimethylamine)technetium(III).

Answers:

A) III, IV and V

B) I, II, III, and IV

C) I, II, and V

D) III and IV

The average human body contains 5.10 L of blood with a Fe2+ concentration of 3.20×10−5 M . If a person ingests 11.0 mL of 25.0 mM NaCN, what percentage of iron(II) in the blood would be sequestered by the cyanide ion?

Copper(I) chloride has K_sp = 1.7 × 10^-7. Calculate the molar solubility of copper(I) chloride in pure water and in various aqueous solutions.

a. Calculate the molar solubility of CuCl in pure water. b. Calculate the molar solubility of CuCl in 0.0200 M HCl solution. c. Calculate the molar solubility of CuCl in 0.200 M HCl solution. d. Calculate the molar solubility of CuCl in 0.300 M CaCl₂ solution

For the reactions shown below, we added 2.25 mL of 0.0460 M HCl to a test tube containing one of the two cations (Ag⁺ or Pb²⁺) and recovered 0.0148 g of precipitate.

AgNO₃(aq) + HCl(aq) → AgCl(s) + HNO₃(aq)
Pb(NO₃)₂(aq) + 2 HCl(aq) → PbCl₂(s) + 2 HNO₃(aq)

How much precipitate in moles would be recovered theoretically if the ion was Ag⁺? (Enter an unrounded value. Use at least one more digit than given.)


How much precipitate in moles would be recovered theoretically if the ion was Pb²⁺? (Enter an unrounded value. Use at least one more digit than given.)
mol

How much precipitate in grams would be recovered theoretically if the ion was Ag⁺?


How much precipitate in grams would be recovered theoretically if the ion was Pb²⁺?

Select the answer for which all statement(s) is/are TRUE regarding ligands in coordination complexes:

I. Complexes with CN = 4 are typically square planar for d^8 metal centers.

II. Chelating ligands always bind the metal center in a polydentate fashion (CN ≥ 2).

III. The charge of the ligands is the only component needed to determine the metal oxidation state in a complex.

IV. Optical isomers exist when a molecule can be superimposed upon its mirror image.

Answer choices:

A) I, II, and IV

B) II only

C) I and II

D) I and III

A weak acid HA (pKa = 5.00) was titrated with 1.10 M KOH. The acid solution had a volume of 100.0 mL and a molarity of 0.107 M. Find the pH at the following volumes of base added: Vb = 0.00, 1.00, 5.00, 9.00, 9.90, 10.00, 10.10, and 12.00 mL. (Assume Kw = 1.01 ✕ 10−14.)

Given a circular sheet of paper with a weight of 0.15 ounces and a diameter of 4.7 in. Calculate the basis weight in terms of g/m^2. Assuming the circle was cut from a piece of copy paper, what would be the basis weight of the paper in lb/ream?

Consider the following reaction: A(g)⇌B(g)+C(g) Find the equilibrium concentrations of A, B, and C for each of the following different values of Kc. Assume that the initial concentration of A in each case is 1.0 M and that the reaction mixture initially contains no products. Make any appropriate simplifying assumptions.

Part A: Kc= 1.0 Express your answer using two significant figures. Enter your answers numerically separated by commas.

Part B: Kc= 2.0×10⁻² Express your answer using two significant figures. Enter your answers numerically separated by commas.

Part C: Kc= 1.4×10⁻⁵ Express your answer using two significant figures. Enter your answers numerically separated by commas.

33. A certain zero order reaction has a half live of 2.5 seconds when the initial concentration is 2.5 M. What concentration of the reactant remains after 4.5 seconds?

34. The reaction shown below obeys second order kinetics with k = 2.50 x 10-3 M-1s-1 at 25 oC. If the initial concentration of A is 2.00 M, how long will it take for concentration of A to decrease to 35.0 % of its original value?

    A + A → products

35. For a certain second order reaction, k = 0.075 M‒1s‒1. If 0.0025 M of reactant remains after 15 minutes, how much of the reactant was present initially?

36. A certain reaction is known to be second order in [A]. What is the numerical value of k, the specific rate constant, if the concentration of [A] decreases from 1.50 M to 0.25 M after 225 seconds?

37. A certain reaction is known to be second order in A with k = 0.95 M‒1s‒1. What is the numerical value of the half-life (τ1⁄2) when the initial concentration of A is 0.45 M?

Calculate the number of pounds of CO 2 released into the atmosphere when a 21.0 gallon tank of gasoline is burned in an automobile engine. Assume that gasoline is primarily octane, C 8 H 18 , and that the density of gasoline is 0.692 g ⋅ mL − 1 . This assumption ignores additives. Also, assume complete combustion. Useful conversion factors: 1 gallon = 3.785 L 1 kg = 2.204 lb