451.4 g of lead reacts with excess oxygen forming 377.0 g of lead(II) oxide. Calculate the percent yield of the reaction.

Describe how H-1 NMR spectroscopy can be used to differentiate cis- from trans-4-tert-butylcyclohexanol.

The specific heat capacity of an unknown metal was determined following Part A of the Experimental Procedure in this experiment. The following table is for Trial 1.

Mass of unknown metal (g) 15.45

Temperature of unknown metal (oC) 95.4

Mass of water(g) 100.0

The specific heat of water (J/g.oC) 4.184

Temperature of water (oC) 23.0

Maximum temperature of water (oC) 25.8

Calculate the specific heat capacity of unknown metal (J/g.^oC) _____

1) Calculate pH of saturated solution of silver nitrite (AgNO2) in water if its solubility

product is Ksp= 6.1*10^-4 and the pKa of nitrous acid is 3.4.

2) Dibasic calcium phosphate (CaHPO4) has limited solubility in water with solubility product of Ksp= 7.23*10^-7. Taking into account ionic interactions, what will be the concentration of Ca2+ ions in the solution saturated with CaHPO4 after 2.5*10^-3 m magnesium chloride (MgCl2) is dissolved in the same solution.

What would the potential of a standard hydrogen (S.H.E.) electrode be if it was under the following conditions?

[H+]=0.59M   P_H2 =3.0 atm T=298 K

Propose a structure for an aromatic hydrocarbon, C9H12, that can form only one C9H11Br product on substitution of a hydrogen on the aromatic ring with bromine.

For each of the following reactions, calculate the grams of indicated product when 15.4 g of the first reactant and 10.5 g of the second reactant is used: Part A 4Li(s)+O2(g)→2Li2O(s) (Li2O) Part B Fe2O3(s)+3H2(g)→2Fe(s)+3H2O(l) (H2O) Part C Al2S3(s)+6H2O(l)→2Al(OH)3(aq)+3H2S(g) (Al(OH)3)

For each of the following:

• Assign Oxidation States (Numbers) to each atom in reactants and products

• Identify the species being reduced and the species being oxidized

• Balance each redox reaction using the Half-Reaction method

O₂ + ClO^-₂ --> H₂O + ClO²

Al + MnO^-₄ --> MnO₂ + Al(OH)^-₄

NO₂^- + Al --> NH₃ + AlO₂

Also could you please explain how you get the oxidation numbers, i am having trouble with that as well as to how you come up with the added electrons on the half reactions. How do you figure those numbers out?

Hydrogen reacts with oxygen to form water. If 16 g of hydrogen is mixed with 16 g of oxygen, how much water can form?

Pre-Lab Exercise: 1. What is a primary standard substance? Give an example. 2. What is meant by the term, equivalence point, during an acid-base titration? 3. What is an indicator? What role does it play in an acid-base titration? 4. Why is it necessary to standardize a NaOH solution? 5. Find the molar concentration of a NaOH solution if 0.3999 g of it is dissolved in water to yield 100.0 mL solution. Watch your sig. fig. 6. Consider the following equation KOH(aq) + HCl(aq) → KCl(aq)+ H2O(l) Calculate the molar concentration of a KOH solution if 25.0 mL of it was required to completely neutralize 37.5 mL of a 0.0800 M HCl solution. 7. What is the criterion to decide whether you need to do more then three titrations?

1.250 g of H2C2O4 are dissolved into 100.0 ml of water which is then titrated with 28.56 ml of NaOH solution. What is the molarity of the NaOH solution? H2C2O4 + NaOH arrow Na2C2O4 + H2O (not balanced) Select one: a. 0.6942 M b. 2.957 M c. 0.4862 M d. 1.945 M e. The correct answer is not given as an option.

Find the pH during the titration of 20.00 mL of 0.2350 M butanoic acid, CH₃CH₂CH₂COOH (K_a = 1.54 ✕ 10^-5), with 0.2350 M NaOH solution after the following additions of titrant.

(a)    0 mL


(b)    10.00 mL


(c)    15.00 mL


(d)    19.00 mL


(e)    19.95 mL


(f)    20.00 mL


(g)    20.05 mL


(h)    25.00 mL

At a pH of 4, the Cu-neocuproine complex formed in the liquid-liquid extraction experiment has a partition coefficient of about 6.3 when equilibrated between the acid aqueous solution and chloroform. Calculate the concentration of Cu in the chloroform phase if 40.0 mL of a 0.26 M aqueous Cu solution buffered to pH 4 is equilibrated with 16.0 mL of chloroform.

A cylinder with a movable piston contains 2.00 g of helium, He, at room temperature. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the volume was changed from 2.00 L to 3.50 L ? (The temperature was held constant.)