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Consider crystallization of sulfanilamide in which 10ml of hot 95% ethanol is added to 0.10g of impure sulfanilamide. After the solid has dissolved, the solution is cooled to room temperature and then in an ice-water bath. No crystal form, even after scratching. Explain why this crystallization is failed? what would you have to do at this point to make the crystallization work?
The hydrogen is collected at 25 degrees Celsius over water. The collected gas occupies 0.899L at a total pressure of 791mm Hg. Calculate the percent zinc
The chiral carboxylic acid A (C5H6O2) reacts with 1 mol of hydrogen gas on catalytic hydrogenation. The product is an achiral carboxylic acid B (C5H8O2). What are the structures of Compounds A and B?
What is the strongest base that may exist in water. What happens to stronger bases
High levels of ozone (O3) make rubber deteriorate, green plants turn brown, and cause people to have difficulty breathing. Calculate delta G at 298 K for the formation of 1 mole of O3 from O2 in urban smog, where [O2]=0.210 atm and [O3]=5.00x10^-7..
write the molecular equation ionic equation net ionic equation and indicate the spectator ions for the precipitation
The enthalpy of the graphite -----> diamond phase transition, which under 100 kbar occurs at 2000K, is +1.9 KJ/mol. Calculate the entropy change of the transition.
calculate the molar mass of vitamin c where a solution contains 55.0 g of vitamin c dissolved 25.0 g of water. the
A sample of gas occupies a volume of 692 mL at 1.24 atm and 85 oC. Calculate the pressure of the gas if its volume is changed to 484 mL while its temperature is held constant.
acetic acid has a ka of about 210-5. a buffer is to be prepared with a ph of 4.5 from 0.1m solutions of sodium acetate
A woman requires taking ibuprofen twice daily in 625mg amount. Each pill in the bottle is 250 mg then determine the number of pills the woman requires to consume each time she needs 625mg dosage
Calculate the voltage (E°cell) produced by the voltaic cell using the rxn between Zn and Cu2+ if [Zn2+]= 0.001M and [Cu2+]= 1.3M
You are in a labratory and need to make 90 mL of a solution that is 2 micrograms Eb per 0.1 mL safflower oil. outline the steps and calculations.
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