I have a couple of pre lab questions regarding N-phenylmaleimide.

1) why it is necessary to prevent N-phenylmaleimide from overheating when recrystallizing???

2) what would be the precautions, in terms of reagents, to be taken in consideration for the preparation of N-phenylmaleimide???

3) what is the reaction solvent for preparing N-phenylmaleimide from maleanilic acid?? what is the recrystallization solvent of this??

*there is no data these are pre-lab worksheet 

draw the hybrid structure of the cyclopentadienyl anion that ligates to the iron in ferrocene and acetylferrocene. draw three of the possible five resonance structures which aid chemists in understanding the distribution of charge by starting with one possible lewis structure and using curved arrow notation to show the movement of electrons to the next. Classify the anion as "aromatic ," anti-aromatic, or non-aromatic

A 5.00 g sample of H2O is removed from a freezer and heated from an initial temperature of -5.00 oC through to a final temperature of 102.0 oC.

(a) Given the following data, calculate the amount of energy that has to be absorbed by the H2O during the whole process.

Freezing point of H2O = 0.00oC;

Boiling point of H2O = 100.oC

ΔHfusion of H2O = 6.01 kJ mol-1

ΔHevaporation of H2O = 40.7 kJ mol-1

Specific heat capacity of ice = 2.05 J g-1 K-1;

Specific heat capacity of water = 4.18 J g-1 K-1

Specific heat capacity of steam = 2.08 J g-1 K-1

(b) Calculate the percentage of the total energy required for the overall process in (a) that is used just in heating the liquid water.

(c) Calculate the mass of ice at 0.00oC, that can be melted in 30 minutes by a heater that produces 8000 kJ of energy per hour but in such a way that only 70% of the heat produced is absorbed by the ice.

Determine the pH of an HF solution of each of the following concentrations. In which cases can you not make the simplifying assumption that x is small? (Ka for HF is 6.8×10−4.)

a) 0.260 M

b) 4.80×10⁻² M

c) 3.00×10⁻² M

Ascorbic acid (vitamin C, C6H8O6) is a water-soluble vitamin. A solution containing 81.0 g of ascorbic acid dissolved in 220 g of water has a density of 1.22 g/mL at 55 ∘C.

Calculate the mass percentage.

Calculate the mole fraction.

Calculate the molality.

Calculate the molarity of ascorbic acid in this solution.

Phathalic acid, H2C8H4O4, is a diprotic acid and has a concentration of 2.9 M. Ka1 = 0.0012 and Ka2 = 3.9 x 10-6. Estimate the concentration of [HC8H4O4-] and [C8H4O4-2] at equilibrium. Determine Kb1 and Kb2. Determine the pH of the solution at each proton dissociation. 11. Calculate the molar solubility of calcium hydroxide (Ksp = 4.8 x 10^6

I NEED TO KNOW HOW DID THEY GET THIS ANSWER PLEASE 0.0012 = x2/2.9 x = 0.059 M equilibrium concentration of HC8H4O4- = 0.059 M

1. Calculate the pH of the following solutions.

a. A solution containing 0.100 M KH2PO4 and 0.200 M K2HPO4

b. A solution prepared by mixing 100.0 mL 0.100 M H3PO4 with 50.0 mL 0.150 M K3PO4

c. A solution prepared by mixing 100.0 mL of 0.100 M H3PO4 and 80.0 mL of 0.200 M KOH.

1.)

A.) Convert 1.35 ✕ 102 grams to milligrams. Enter your answer using standard scientific or "e" notation and the correct number of significant figures (for example, 105 = 1.05e2).

B.) How many grams are in 1.120 kilograms? Enter your answer using standard scientific or "e" notation and the correct number of significant figures (for example, 105 = 1.05e2).

C.) What is the final volume of 180. mL of oxygen gas at 60.0°C if the gas is heated to 213°C? Assume the pressure and the amount of gas are held constant.

D.) What mass of propane gas, C3H8, will occupy 440. mL at 570. mm Hg and 52.5°C?

E.) What is the final pressure of 925 mm Hg of carbon dioxide gas at 224°C if the gas is cooled to 77.5°C? Assume that the volume is held constant.

F.) What is the final volume of 630. mL of neon gas at 183°C if the gas is cooled to 39.0°C? Assume the pressure and the amount of gas are held constant.

*Solve the question with arbitrary number* Thank you!

1.

a. Each milliliter of an otic solution (Auralgan) contains the following ingredients. Calculate the amount of benzocaine required to manufacture (a given #) 12 mL containers of this product. (Answer to the nearest tenth of a gram – one decimal point)

Antipyrine                (a given amount) mg

Benzocaine              (a given amount) mg

Dehydrated glycerin   to make (a given volume) mL

b.

Given the following prescription for a child (a given #) pounds. If the dose of ranitidine for a child is (a certain # of mg/kg/day) how many of a (a given strength of a tablet) tablets are needed to prepare the following prescription? (Answer to the nearest whole tablet - no decimal point)

Rx

    Ranitidine _____

    Cherry syrup qsad 120mL

    Sig: One teaspoonful twice daily for 8 days

1) What is the pH at the equivalence point in the titration of a 21.9 mL sample of a 0.456 M aqueous hypochlorous acid solution with a 0.494 M aqueous potassium hydroxide solution?

pH =

2) When a 29.8 mL sample of a 0.430 M aqueous hydrocyanic acid solution is titrated with a 0.373 M aqueous potassium hydroxide solution, what is the pH after 51.5 mL of potassium hydroxide have been added?

pH =

Calculate the Kovats retention index for an unknown using the following retention times: 1.2 min for CH4, 11.4 min for octane, 16.0 min for the unknown, and 17.1 min for nonane

Solid NaI is slowly added to a solution that is 0.0083 M Cu⁺ and 0.0091 M Ag⁺.

Which compound will begin to precipitate first?

Calculate [Ag⁺] when CuI just begins to precipitate. Enter your answer in scientific notation.

What percent of Ag⁺ remains in solution at this point?

1.Why are there two different values for R?(R = 8.314472 JK^-1mol^-1 = 0.0820574 L atm K^-1 mol^-1

^2.Why are liquid barometers filled with mercury rather than water?

3. Using the concepts of the kinetic theory of gases, describe WHY one gas will diffuse through another.

4. Why does hot air rise? Prove your answer using the ideal gas equation

5. Why do gases show a positive deviation from ideal behaviour at high pressures? (i.e Why don’t they only show negative deviations?)