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Is the skeleton of caffeine flat? How might the structure of caffeine account for the fact that it sublimes at atmospheric pressure instead of melting?
One of the students in lab decided to use two fractionating columns (one on top of the other) instead of just one. How would this: a) affect the separation between hexane and heptane?
Why is it possible to us ehtnol to extract an organic compound from water even though most organics are more soluble in ethanol than in water?
determine how many kgs of ca are there in a 205-pound man if 1.4 percent of the mass of a human body is calciumca?an
Please explain the following technical terms used in mass spectrometry: a) Molecular ion,
What is the percent by mass of NaHCO3 in a solution containing 20 g NaHCO3 dissolved in 700 mL H2O?
If 2 x 10-4 moles of S2O82- in 50 mL solution are consumed in 188 seconds, what is the rate of consumption of S2O82-
A solution containing 0.2 mol of KBr and 0.2 mole of MgBr2 in 2.0 liters of water is provided. How many moles of Pb(NO3)2 must be added to precipitate
The standard free energy for the neutralization of HCl with NaOH at 25 degrees Celsius is -79.9KJ/mol. Calculate the equilibrium constant for the reaction.
Ignoring any side reactions and assuming the reaction occurs completely, how large (in kg) an oxygen candle (KClO3) would be needed to supply 8 people with enough oxygen for 24 hours on a small submarine?
Draw a mechanism to demonstrate how pyridine catalyzes the hydrolysis of acetic anhydride to two molecule of acetic acid. Is this reaction reversible? why or why not? Show all non-bonding electrons on each atom, circle positive charges
How many grams sodium chloride (mol wt = 58.4g/mole) are needed to make 550 mL of a 1.90 M aqueous solution of sodium chloride
What volume of 0.0852 M Sr(OH)2 solution is required to neutralize 25ml of 0.155 M HF?
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