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After swimming in a pool or lake, the air feels cool because heat is required to evaporate the water from our skin. How much heat is required to evaporate 20.6 g of water? The enthalpy of vaporization of water is 44.0 kJ/mol.
The density of the solution is 0.993 g/mL. What is the molarity and molality of acetone in this solution?
why helpful.source site should show IGC,ILC, Trouble shooting and column packing
magnesium hydroxide is 54.87% oxygen by mass. How many grams of oxygen are in 175g of the compound ?
Calculate the pH of CO2-saturated water at 25 degrees C, given that the CO2 concentration in air is 366 and that for carbon dioxide the Henry's Law constant KH=3.4E-2 mol L-1 atm-1 at 25 degrees C.
synthesis of methyl orange as a guide, outline an experimental strategy for its synthesis, using any shelf-stable starting materials of your choice. Be sure to also include relevant details such as solvents, reaction temperature, cooling/heating
If 323 g of magnesium reacts with excess oxygen to produce 296 g of magnesium oxide, what is the percent yield for the reaction?
What one reagent should re-energize the light solution after it has faded? Explain using moles and limiting reagents.
Suppose a volume is divided into three equal parts. How many microstates exist for distributing four molecules among the three parts?
A gas expands and does P-V work on the surroundings equal to 325 J. At the same time, it absorbs 161 J of heat from the surroundings. Calculate the change in energy of the gas.
A nugget of pure gold of 4.80 grams is absorbed 284 Joules of heat. if the initial temperature was twenty eight degree Celsius then what was the final temperature of the Au? The specific heat of gold = 0.129 J/(g·°C)?
In the titration, 20.46 mL of the sodium hydroxide was used to react with 0.1082 grams of KHP. What is the molarity of the NaOH?
Compute pH of a solution containing .030 moles of TRIS and .020 moles of the salt TRISHCl in a total volume of 1.50L
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