The mass of an aluminum boat is 4.9682 g. The mass of an aluminum boat and mixture of sand, NaCl, and (NH4)2CO3 is 6.5172 g. After sublimation of (NH4)2CO3, the mass of the boat and mixture is 6.1532 g. Water is added to the mixture and the resulting solution is filtered. After the sand is dried, the mass of the sand is 0.7648 g. After evaporation of the filtrate , the mass of salt is 0.4024 g. Calculate the % of sand, % of NaCl, and the % of (NH4)2CO3 in the mixture (show all calculations). Do these precentages add to 100%? if not, provide an explanation.

P4

100 moles of Benzene (A) and Toluene (B) mixture containing 60 % (mole) of benzene is subjected to a differential distillation at atmospheric pressure till the composition of benzene in the residue is 33 %. Calculate the total moles of the mixture distilled. Average relative volatility may be assumed as 2.16.

Nitroglycerine (C3H5N3O9) is a very sensitive explosive used to make dynamite. If all of the nitrogen in this compound is released as N2, calculate the total mass of nitrogen gas released when 3.81 kg of nitroglycerine is detonated.

You wash a Coplin jar with soap and water to ensure it is clean before running a TLC. You should take the time to make sure there are no drops of water left inside the jar. (True or False)The solvent that the sample is dissolved in must always be the same as the eluant when running a TLC plate.(True or False)You are preparing to spot a sample of crude benzophenone and pure benzophenone on two separate lanes of a TLC plate to analyze the crude product. You can use the same TLC spotter for both samples.(True or False)After running a TLC plate to compare crude benzophenone and pure benzophenone you determine you need to prepare a new TLC plate and rerun the TLC. You can use the same spotter for the crude benzophenone as you did for the first TLC plate.(True or False)

A mixture is 12.5 weight % propylene (C3H6), 12.5 weight % benzene (C6H6), and 75.0 weight % cumene (C9H12). For the mixture described above, calculate the average molecular weight of the mixture (g/mol).

The clear plastic bottles used for carbonated beverages (sometimes also called “soda,” “pop,” or “soda pop”) are made from poly(ethylene terephthalate) (PET). The “fizz” in pop results from dissolved carbon dioxide (CO2); because PET is permeable to CO2, pop stored in PET bottles will eventually go “flat” (i.e., lose its fizz). A 20-oz. bottle of pop has a CO2 pressure of about 794 kPa inside the bottle, and the CO2 pressure outside the bottle is 7.6 kPa. Assuming conditions of steady-state, calculate the diffusion flux in cm3 at STP/cm2.s of CO2 through the wall of the bottle. The Permeability Constant of the PET bottle is 0.23 x 10^-13 cm3@STP.cm/cm2.s.Pa. Note: assume that each bottle has a surface area of 500 cm2 and a wall thickness of 0.04 cm. Answer in Scientific Notation example 1.1e-12. Round your answer to 2 significant figures.

ABS plastic is a polymer consisting of three monomer units: acrylonitrile (C₃H₃N), butadiene (C₄H₆), and styrene (C₈H₈). A sample of ABS plastic contains 12.9% N by mass. It took 1.56 g of Br₂ to react completely with a 2.00 g sample of ABS plastic. Bromine reacts 1:1 (by moles) with the butadiene units in the polymer and nothing else, so bromination is a method for determining the quantity of butadiene in the polymer. What is the percent by mass of styrene in the polymer?

The clear plastic bottles used for carbonated beverages (sometimes also called "soda," "pop," or "soda pop") are made from poly(ethylene terephthalate) (PET). The "fizz" in pop results from dissolved carbon dioxide (CO2); because PET is permeable to CO2, pop stored in PET bottles will eventually go "flat" (i.e., lose its fizz). A 20-oz. bottle of pop has a CO2 pressure of about 794 kPa inside the bottle, and the CO2 pressure outside the bottle is 7.6 kPa. Assuming conditions of steady-state, calculate the diffusion flux in cm3 at STP/cm2.s of CO2 through the wall of the bottle. The Permeability Constant of the PET bottle is 0.23 x 10^-13 cm3@STP.cm/cm2.s.Pa. Note: assume that each bottle has a surface area of 500 cm2 and a wall thickness of 0.04 cm. Answer in Scientific Notation example 1.1e-12. Round your answer to 2 significant figures.

2. Carbon nanotubes (CNT) are among the most versatile building blocks in nanotechnology. These unique pure carbon materials resemble rolled-up sheets of graphite with diameters of several nanometers and lengths up to several micrometers. They are stronger than steel, have higher thermal conductivities than most known materials, and have electrical conductivities like that of copper but with higher current- carrying capacity. Molecular transistors and biosensors are among their many applications. While most carbon nanotube research has been based on laboratory-scale synthesis, commercial applications involve large industrial-scale processes. In one such process, carbon monoxide saturated with an organo-metallic compound (iron penta- carbonyl) is decomposed at high temperature and pressure to form CNT, amorphous carbon, and CO2. Each "molecule" of CNT contains roughly 3000 carbon atoms. The reactions by which such molecules are formed are: Decomposition of Fe(CO)s to form iron, which…