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If an aqueous solution of Co(NO3)2 has a molar absorptivity of 5.10 L/mol.cm at 505 nm. What will be the absorbance of a 0.075 M solution?
calcuium hydroxide in an acid-base titration to neturalize an acid to the equivlant point. How many mols of potassium hydroxide would be needed to complete the same neutrization?
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?
Two gas reservoirs, A and B, have the same volume and contain gas at the same temperature. Reservoir A contains 7.62g of He gas at a pressure of 1.20atm. Reservoir B cotains Ne gas at a pressure of 1.80atm. Determine the mass of Ne gas in containe..
Consider the compounds water, ethylamine, acetone, and aniline, whose Kb values can be found here. Classify them by whether they can be appreciably (Keq>1) protonated by: pyridinium, CH3OH2 , both, or neither.
Ammonium nitrate (NH4NO3) decomposes into nitrogen, oxygen, and water. If 12g of ammonium chloride decompose entirely at 300 C with delta H reaction =-236.kJ
If a first-order reaction has a rate constant of 2.11x 10-1s-1 at a temperature of 22.3°C, what would the value of k be if the reaction temperature was changed to 65.7°C given
A 64 g piece of ice at 0 degrees celsius is added to a sample of water at 9 degrees celsius. all of the ice melts and the temperature of the water decreases to 0 degrees celsius. How many grams of water were in the sample?
What are the purpose/s of determine the melting point range for your product of acetaminophen? Note that there may be more than one correct answer.
When 13.0 g of the mixture is dissolved in enough water to make 500. mL of solution, the solution exhibits an osmotic pressure of 6.85 atm at 25°C. Determine the mass percentage of NaCl in the mixture.
This was allowed to react under reflux for an hour and then the products seperated. I wrote out a mechanism before lab and ended up predicting 4-chlorobenzoic acid and 4-chlorophenol as my final products.
methane can be obtained from coal using a process called the gasification of coal. the global chemical equation for the
what is the percent yield of a reaction in which 212 g phosphorus trichloride reacts with excess water to form 137 g
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