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What is the enthalpy change corresponding to the melting of 2.5 moles of H2O? What is the system? What is the surrounding? In what direction does the heat flow? Is the process endothermic or exothermic?
Properties of Electrolyte Solutions, In the winter of 1994, record low temperatures were registered throughout the United States. For example, in Champaign, Illinois, a record low of -29 F was registered.
A 2.154-g sample of HgO produces 125 mL of oxygen collected over water at 24 degrees C and an atmospheric pressure of 763 mm Hg. Calculate the STP molar volume for oxygen.
How much potassium nitrate has to dissolve in water to absorb 118 kj of heat? Lattice E is -163.8kcal/mol and heat of hydration is -155.5 kcal/mol.
What is the molality of a solution in which 15g of I2 is dissolved in 500g of alcohol?
The simplest formula of a substance is found to be CH2O, and its approximate molar mass is found by experiment to be 93 g•mol-1. What is its exact molar mass?
First ,2-chlorotoluene react with acetylchloride. then acylation product (an oil ) react with its corresponding carboxylic acid(aluminum(3) chloride)
How many grams of camphor (C10H16O) are needed to raise the boiling point of 43.5grams of benzene by 2.10 degress Celcius? The Kb of benzene is 2.67degress Celsius/molality.
Understanding the basics of thermal chemistry and The Second Law of Thermodynamics indicates that a system
What molar ratio of benzoate ion to benzoic acid would be required to prepare a buffer with a pH of 5.20? [Ka(C6H5COOH) = 6.5 * 10-5]
How many grams of Ca(OH)2 are needed to neutralize 3.6 moles of HCl in 655 mL of solution? The molar mass of HCl is 36.46 g/mol. The molar mass of Ca(OH)2 is 74.1 g/mol.
Three gases (8.00 rm g of methane, CH_4, 18.0 g of ethane, C_2H_6, and an unknown amount of propane, C_3H_8) were added to the same 10.0 L container.
A 2.01 g sample of a salt dissolves in 9.10 g of water to give a saturated solution at 25°C. What is the solubility (in g salt/100 g of H2O) of the salt?
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