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A 0.421 g sample of aspirin prepared in the laboratory is dissolved in 95% ethanol, diluted with water, and titrated to a phenolphthalein endpoint with 17.3 mL of 0.114 M NaOH. What is the percent purity of aspirin in the sample?
a compound x contains the elements carbon hydrogen and oxygen. after 35 g of x were burned in pure oxygen 59 g of
Chemists have discovered nearly 300 different anthocyanins. Finish drawing a resonance contributor in Box 3 that shows positive charge on one of the other oxygens in this anthocyanin. It is not necessary to draw any electron flow arrows in your re..
how much energy is needed to heat 24.8g water from 64 degrees to 123 degrees celsius?
A new soft drink on the market is prominently labeled as "caffeine-free". Based on the nature of complaints filed by several consumers, it appears that the "caffeine-free" claim might actually be fraudulent.
How much heat is required to warm 231 g of ice from -46.9°C to 0.0°C, melt the ice, warm the water from 0.0°C to 100.0°C, boil the water, and heat the steam to 173.0°C?
In the synthesis of aspirin, what would happen if a student tried to quench the reaction by adding excess aqueous sodium hydroxide instead of 8 mL of water
If 3.00 g of PbO2 was allowed to react with 2.00 g of Pb and 2.00 g of sulfuric acid, then 0.0116 mol of PbSO4 was obtained. What was the percent yield of PbSO4 (by weight) for this reaction?
While mercury is very useful in barometers, mercury vapor is toxic. Given that mercury has a DHvap of 56.9 kJ/mol and its normal boiling point is 356.7°C, calculate the vapor pressure in mm Hg at 25°C. the answer is 4.29 x 10-3 mm Hg
A 0.831-g sample of SO3 is placed in a 1.00-L container and heated to 1100 K. The SO3 decomposes to SO2 and O2: 2SO3(g) 2SO2(g) + O2(g). At equilibrium the total pressure in the container is 1.300 atm. Calculate Kp for the above reaction at 1100..
What mass of CCl2F2 substance must evaporate in order to freeze 109 of water initially at 24 degrees celsius? (The heat of fusion of water is 334 J/g the specific heat of water is 4.18 J/gK .)
A 0.05M H2S solution contains 0.15M NiCl2 and 0.25M Hg(NO3)2. What pH is required to precipitate the maximum amunt of HgS but none of the NiS
An athlete takes human growth hormone (HGH) that enhances his ability to have the best time of any Olympic marathon runner in history.
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