What fraction of energy is used to change internal energy
The molar enthalpy of vaporization of water at 373 K and 1.00 atm is 40.7 kJ/mol. What fraction of this energy is used to change the internal energy of the water?
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How many grams of dry NH4Cl need to be added to 2.40 L of a 0.400 M solution of ammonia, NH3 , to prepare a buffer solution that has a pH of 8.58? Kb for ammonia is 1.8*10 ^-5.
What type of electronic probe could be used to determine the pressure inside the balloon
A .150 gram sample of solid lead(II) nitrate is added to 125 mL of .100 M sodium ... .100 M sodium iodide solution. Calculate the number of moles of each reactant? ....
Write the full electronic configuration for Sr, He, Zn, Br
The temperature rose by 0.910 K. In a separate experiment in the same calorimeter, the combustion of 0.825 g of benzoic acid, for which the internal energy of combustion is -3251 kJ mol-1, gave a temperature rise of 1.940 K. Calculate the internal
Phenol Red is an H-Indicator. The skeleton reaction is. What happens in the first reaction in order to produce the yellow solution?
What external pressures have moved mainstream medicine to accept alternative therapies? Have any alternative therapies been proven to work as well as standard treatments?
Calculate the pH of a solution made by adding 18 g of sodium acetate, NaCH3COO, to 20. g of acetic acid, CH3COOH, and dissolving in water to make 100. mL of solution.
Radioactive isotope X has been found in rock units S and Q. Isotope X breaks down into isotope Z with a half life of 250 million years. Samples from unit Q indicate 25% parent isotope X and 75% daughter isotope Z while unit S has 6.25% parent isot
We add 10 mL of 0.1 M NaOH to 100 mL of solution containing 0.1 M CH3CO2H and 0.1 M CH3CO2-. (Ka = 1.8 x 10-5) Using the Henderson-Hasselbalch equation, pH = pKa + log([A-] / [HA]), determine the pH after the addition of NaOH.
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Determine the economic order quantity (EOQ) and annual total cost assuming no waste disposal
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