Consider the titration of a 26.0-mL sample of 0.180 M CH3NH2 with 0.145 M HBr. (The value of Kb for CH3NH2 is 4.4×10−4.)

Already found:

volume of added acid required to reach the equivalence point.=32.3 ml

pH at 6.0 mL of added acid=11.28

pH at one-half of the equivalence point.= 10.64

Part A

Determine the initial pH

Part B

Determine the pH at the equivalence point.

Part C

Determine the pH after adding 5.0 mL of acid beyond the equivalence point.

For each of the following pairs of molecules, identify the dominate intermolecular force, and answer any associated questions.

a. KNO2, CH3NO2

Which compound do you expect to have the highest melting point?

b. CH3CH2OH, CH3OCH3

Which compound do you expect to have the highest boiling point?

c. KF, BrF

Which compound do you expect to have the greatest vapor pressure?

List the dominant IMF for each molecule:

d. NH3, N2

e. CF4, CCl4

f. HCN, KCN

g. LiCl, CH3CH3

h. CH3OH, CH3F

Please explain each step.

• Draw products for the following addition reactions:
  • Hydrogenation (H₂ / Pt)
  • Halogenation (X₂)
  • Hydrohalogenation (HX)
  • Hydration (H₂O, H⁺)

1a. What happens to the pressure of an ideal gas if you double its temperature in a closed volume? And what happens to the pressure of an ideal gas if you double its volume at a fixed temperature?Please explain your answer using the combine gas law.

1b. Based upon the standard molar volume, what volume would 0.500 moles of an ideal gas occupy at STP? And based upon the standard molar volume, what volume would be occupied by 1.00 mol of an ideal gas at a temperature of 819.45 K and a pressure of 760.0 mmHg?Please explain your answer.

Walter White who lives in Simeranya (a utopic city in Anarres) prepares blue crystals, named as m...

Walter White who lives in Simeranya (a utopic city in Anarres) prepares blue crystals, named as myth, which adopt a side-centered cubic (scc). In this scc cell, atoms occupy all the edge centers. 1. Determine the number of atoms per unit cell. 2. Calculate the atomic packing factor (APF) of scc unit cell. 3. Determine the coordination number. 4. Draw the atomic arrangements for the following the crystallographic planes; (222), (111), and (002). 5. Determine the coordination number of the largest interstitial hole in this unit cell. 6. Assume that an atom that is 1.2 times larger than the original atom fills in the hole mentioned in Q5. Calculate the APF of this unit cell. Units: NA= 6.02×1023 atoms/mol

please, answer all my questions. This is the third time I sent these questions to Chegg.

Which of the following produces the most stable carbocation?

allyl bromide

2-bromo-2-methylpropane

bromobenzene

benzyl bromide

Photochemical isomerization of Alkene: cis-1,2-dibenzoylethylene

6-38: What are some clues that tell you that you have made a different isomer product in this reaction?

6-39: Suggest a reason why the starting material (trans-1,4-diphenyl-2-butene-1,4-dione) should be recrystallized(or pure) prior to use ( NOTE: you did not perform the recrystallization, but were provided with the recrystallized material).

6-40:Cis-and trans-1,4-diphenyl-2-butene-1,4-dione are stereoisomers. What is the specific relationsip between the two of them?

6-41:Explain how this photochemical isomerizartion allows the production of the thermodynamically less stable cis isomer. In other words, why is the trans isomer exclusively converted to the cis isomer during short reaction periods and not vice versa? is it possible, under these conditions, that the trans and cis isomers are in rquilibrium with one another?

Q1) The interior lighting of refrigerator is provided by incandescent lamps whose switches are actuated by the opening of the refrigerator door. Consider a refrigerator whose 50 W light bulb remains switched on continuously as a result of malfunction of the switch. If the refrigerator has a coefficient of performance of 1.25 and the cost of electricity is 9 pence per kWh, determine the increase in the energy consumption of the refrigerator and its cost per year (365 days) if the switch is not fixed. You may assume that the refrigerator is opened 30 times per day for an average of 20 seconds on each occasion.

Consider the titration of 80.0 mL of 0.0200 M C5H5N (a weak base; Kb = 1.70e-09) with 0.100 M HNO3.

Calculate the pH after the following volumes of titrant have been added:

(a) 0.0 mL pH =

(b) 4.0 mL pH =

(c) 8.0 mL pH =

(d) 12.0 mL pH =

(e) 16.0 mL pH =

(f) 25.6 mL pH =

PART TWO:

A buffer solution contains 0.14 mol of ascorbic acid (HC₆H₇O₆) and 0.84 mol of sodium ascorbate (NaC₆H₇O₆) in 2.80 L.
The K_a of ascorbic acid (HC₆H₇O₆) is K_a = 8e-05.



(a) What is the pH of this buffer?

pH =  


(b) What is the pH of the buffer after the addition of 0.07 mol of NaOH? (assume no volume change)

pH =  


(c) What is the pH of the original buffer after the addition of 0.21 mol of HI? (assume no volume change)

pH =  

Calculate the pH of the solution after the addition of the following amounts of 0.0568 M HNO3 to a 80.0 mL solution of 0.0750 M aziridine. The pKa of aziridinium is 8.04.

a) 0.00 mL of HNO3

b) 8.62 mL of HNO3

c) Volume of HNO3 equal to half the equivalence point volume

d) 102 mL of HNO3

e) Volume of HNO3 equal to the equivalence point

f) 89.2 mL of HNO3

thank you

Calculate the number of grams of sodium in 8.3 gg of each of the following sodium-containing food additives.

NaClNaCl (table salt)

Na3PO4Na3PO4 (sodium phosphate)

NaC7H5O2NaC7H5O2 (sodium benzoate)

Na2C6H6O7Na2C6H6O7 (sodium hydrogen citrate)

A sample of gas contains 4.44 moles of oxygen, 1.35 moles of nitrogen, and 1.13 moles of carbon dioxide. If the total pressure is 4.14 atm, what is the partial pressure of the oxygen in atm?

Consider a concentration cell. Two Ag-electrodes are immersed in AgNO3 solutions of different concentrations. When the two compartments have an AgNO3-concentration of 1 M and 0.1 M, respectively, the measured voltage is 0.065 V (note: T in not necessarily = 25°C !).

a. What is the voltage, if the two compartments have AgNO3-concentration of 1 M and 0.01 M, respectively?

The electrochemical behavior of silver nanoclusters (Agn, with n the number of Ag atoms in the cluster) is investigated using the following electrochemical cells at 298 K:
I. Ag(s) | AgCl (saturated) || Ag+(aq, 0.01M) | Ag(s), E=0.170
II. (Pt electrode) Agn (s, nanocluster) | Ag+(aq, 0.01M) || AgCl (saturated) | Ag(s), with E = +1.030 V for Ag5 nanocluster and E = +0.430 V for Ag10 nanocluster

The standard reduction potential for Ag+ + e- → Ag, is E0 = +0.800 V.

b. Use this data to calculate the solubility product of AgCl.

The two nanoclusters Ag5 and Ag10-nanoclusters have standard potentials different from the potential of metallic bulk silver.

c. Calculate the standard potentials of Ag5 and of Ag10 nanoclusters. [for this part use Ksp(AgCl)=1.800·10-5; this is not the same value as calculated in b.]

d. What happens, if you put the Ag10 nanoclusters and – in a second experiment – the Ag5 nanoclusters into an aqueous solution of pH=5? Estimate the consequences using the reduction potentials you calculated.

Carbon disulfide is prepared by heating sulfur and charcoal. The chemical equation is

S2(g)+C(s)−⇀↽−CS2(g)Kc=9.40 at 900 KS2(g)+C(s)↽−−⇀CS2(g)Kc=9.40 at 900 K

How many grams of CS2(g)CS2(g) can be prepared by heating 16.5 mol S2(g)16.5 mol S2(g) with excess carbon in a 9.40 L9.40 L reaction vessel held at 900 K until equilibrium is attained?

mass of CS2(g)CS2(g):

Into a 67.2L container containing O₂ (g) at STP is added 32.0g CH₄(g); the container is sealed and the mixture is combused. Assuming that all reactants and products remain as gases, waht will be the final pressure of the container and the partial pressures of each gas after the flask cools to 100^oC?