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Suppose that 28 of gold is initially at 29.0. What is the final temperature of gold upon absorbing 2.45kJ of heat?
What safety, environmental, and economic considerations would be important to a company manufacturing 1 million pounds of aspirin each year by this procedure? Which ones are most important?
What is the percentage yield of SO3 if 22.3 g SO3 are obtained from the reaction of 25.0 g SO2 with an excess of O2?
Draw all stereoisomers of 2,3,4-tribromopentane. You should find two meso structures and one pair of enantiomers. Use bold and hashed wedges to show the stereochemistry.
What are some reasons why there would be a difference between the expected and actual values for the moles of copper oxide produced from heating copper in the air?
Calculate the pH at 25 degrees celsius of a solution prepared by adding 50 mL of 1.60 M NaOH solution to 0.5 of .0850 M HC5H3O3.
How many carbons does a fatty acid typically have? Are there ever double bonds present? If so, what isometric conformation are they normally in (cis or trans)?
Given that 10.40 mL of NaOH is required to react completely with 20.0 mL of 0.200 M KHP solution, what is the concentration of the NaOH solution?
A solution is prepared by adding 5.00 grams of an unkown compound to 217 g of cyclohexane (C6H12). This solution freezes at 4.5 degree C. Calculate the molar mass of the compound.
Answer the following questions based on the information provided above and justify your answer next to each question. Which of the ions are present in the solution sample?
Suppose that your mixture showed a good TLC separation with methylene chloride, but you inadvertently eluted the column with methanol. What would happen?
How many grams of H2O can be cooled from 45 degrees C to 15 degrees C by the evaporation of 63 grams of water. The heat of vaporization is 2.4 KJ/gram and the Specific Heat of water is 4.18 J/gK.
A solution of salt (molar mass 90 g mol -1) in water has a density of 1.29 g/mL. Calculate the mole fraction of the salt in the solution
A sample of gas occupies a volume of 396 mL at 1.28 atm and 72 oC. Calculate the volume of the gas if its temperature is changed to -31.5 oC while its pressure is held constant.
If a person ingests 9.00 mL of 14.0mM NaCN, what percentage of iron(II) in the blood would be sequestered by the cyanide ion?
A 1.50 L mixture of helium, neon, and argon has a total pressure of 1.47 atm at 298K. If the partial pressure of helium is 0.38 atm, and the partial pressure of argon is 0.32 atm, what mass of neon
What is the pH after 0.195 mol of NaOH is added to the buffer? Assume no volume change on the addition of the base.
A bacterial culture isolated from sewage produced 35.5 mL of methane, CH4, at 31 oC and 753 mmHg. What is the volume of this methane at STP?
What proportions of ethanol and water should be mixed in order to produce 100 cm3 of a mixture containing 50 percent by mass of ethanol?
A cylinder of compressed nitrogen gas contains 867 g N2. If the volume of the cylinder is 22.5 L, what is the pressure of the N2 if the gas temperature is 298K?
A syringe initially holds a sample of gas with a volume of 285 mL at 355 K and 1.88 atm. To what temperature must the gas in the syringe be heated/cooled in order to have a volume of 435 mL at 2.50
To what pressure should you fill the acetylene tank to ensure that you run out of each gas at the same time? Assume ideal behavior for all gases.
Helium gas at 25 oC filled a balloon to a volume of 2.25 L. What would the volume of this balloon be when cooled (at constant pressure) to liquid-nitrogen temperature (-196 oC)?
What temperature must a balloon, initially at 25 C and 2.00 L, be heated in order to have a volume of 6.00 L?
Assuming that the coal was 83.8 % carbon by mass and that combustion was complete, calculate the number of tons of carbon dioxide produced by the plant during the year.