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What properties are necessary and desirable for a solvent in order that it is well suited for recrystallizing a particular organic compound?
What is the connection between thermodynamics and chemical equlibria. What is the connection between thermodynamics and electrochemical equilibria.
How many grams of NaCl would you add to a beaker before adding distilled water (Q.S.) to make 250 mL of an isotonic solution
What is the balanced net ionic equation for precipitation of CaCO3 when aqueous solutions of Na2CO3 and CaCl2 are mixed
a sample of propane, contains 17.7 moles of carbon atoms. How many total moles of atoms does the sample contain.
propose a structure for an amine of formula C4H9N, which liberates a gas when treated with NaNO2 and HCl. The 13C NMR spectrum is as follows with attached protons in parentheses: delta 14 (2), delta 34.4(2), delta 50.0(1)
Calculate the heat evolved when 306 g of white phosphorus (P4) burns in air according to the equation below.
Explain what is the pH of a sodium acetate solution prepared by adding 0.820 grams of sodium acetate to 100.0 ml of water at 25.0oC? The Ka at 25.0 oC for acetic acid is 1.8 × 10-5
Presuming complete dissolution of NaCl, explain how much NaCl (in g) must be added per liter of wastewater to make sure that the soluble silver concentration is less than or equal to 1 µg/L? Presume low pH so you can ignore any complexion of silve..
4Au + 8KCN + O2 + 2 H2O --> 4 KAu(CN)2 + 4 KOH what is the minimum amount of KCN (in g) needed to react with 15.6 g of gold?
An experiment requires 15.0 g of cyclohexane, whose density at 25 c is 0.7781 g/ml. what volume of cyclohexane should be used
fe2o3 2al - 2fe al2o3if you start with 50.0g of iron iii oxide and 25.0 g ofaluminum in the above problem what is the
What are the signs of Hvap and Svap for water. Do you expect the signs of these quantities to be the same for other liquids. Explain.
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