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5. Assume that you are an experienced organic chemist with perfect recrystallization technique.You recrystallize 10 g of impure naphthalene from ethanol in Portland, OR (elevation; sea level)and recover 7.4 g of pure naphthalene.
a. If you were to repeat the experiment with 10 g of sample in Mexico City (elevation: 7700 ft)what change, if any, would there be in the amount of boiling ethanol needed to dissolve theimpure naphthalene? Explain your answer clearly.
b. What change, if any, would there be in the amount of pure naphthalene recovered? Explainyour answer clearly. (Assume that the temperature of the mixture just before filtration is thesame in both labs.)
How many moles of methane are produced when 85.1moles of carbon dioxide gas react with excess hydrogen gas
What percent of the hydrogen peroxide has been decomposed in mixture of (0.10M KI = 15.0mL, H2O= 35.0 mL and 3% hydrogen peroxide= 10.0 mL) when 20.0 mL of O2 gas has been evolved
calculate the equilibrium concentrations of h2o co2 and h2 in a reaction mixture obtained by heating 6.00 of steam and
At 25C, the molar solubility of lead sulfate is 1.4*10^-4 molarity. The solubility in g/L is 4.24*10^-2. 23.6 L of water are required to dissolve 1g of lead sulfate. What is the solubility of lead sulfate in parts per million
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a gas sample containing 1.56 mol at 25degc exerts a pressure of 394 torr. some gas is added to the same container and
Problem- Water is added to 1.3 g of sodium fluoride to give a 0.13 M solution of sodium fluoride. What is the final volume of the solution. In mL illustrate two decimal places in your answer
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When 25.0 mL of 0.400 M H2SO4 and 50.0 mL of 0.850 M H2SO4 are mixed, what is the molarity of sulfuric acid in the final solution?
What partial pressure of dinitrogen monoxide gas is required in order for 0.00280 g of the gas to dissolve in 11.4 mL of pure water. The Henry's Law constant for dinitrogen monoxide gas is 2.4 x 10-2 M atm-1.
The vibrational transition for H35CL occurs at 2885.6 cm-1. If D35Cl has the same force constant, where would the transition occur for DCl
The annual income is less the operating expense is expected to be $50,000. Annual interest is 6 percent compounded annually. When is the most favorable time to replace the machinery. Compute the present worth of the profit if the machinery is replace..
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