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Compute the enthalpy change upon converting 36.0 g of ice at -25 °C to water vapor (steam) at 125°C under a constant pressure of 1 atm. The specific heats of ice, water and steam are 2.03 J/g-K, 4.18 J/g-K, and 1.84 J/g-K, respectively. For H2OHfus = 6.01 kJ/mol and Hvap = 40.67 kJ/mol.
In the production of printed circuit boards for the electronics industry, a 0.715 mm layer of copper is laminated onto an insulating plastic board. Next a circuit pattern made of a chemically resistant polymer is printed on the board.
When 5.454 grams of a hydrocarbon, CxHy, were burned in a combustion analysis apparatus, 17.11 grams of CO2 and 7.006 grams of H2O were produced.
when atoms lose more than one electron, the ionization energy to remove the second electron is always more than the ionization energy to remove the first.
Electrolysis of molten NaCl in a Downs cell is the major isolation step in the production of sodium metal. Suppose 242 g of Na metal is formed. How many moles of electrons are required. How many coulombs are required
an unknown gas effuses at a rate that is only 0.468 times that of o2 at the same temperature. what is the molar mass of
You are going to administer 201 / 81 Ti to a patient in preparation for a stress test in a patient with possible coronary artery disease. The half-life of 201 / 81 Ti is 73.0 hours.
An aqueous solution of sodium hydroxide is standardized by titration with a 0.266 M solution of hydrobromic acid. If 17.4 mL of base are required to neutralize 28.4 mL of the acid, what is the molarity of the sodium hydroxide solution
an experiment requires 44.0 g of ethylene glycol a liquid whose density is 1.114 gml. rather than weigh the sample on a
A study of the system 4NH3(g)+7O2(g)--2N2O4(g)+6H2O(g), was carried out. A system was prepared with [NH3]=[O2]=3.60 M as the only components initially.
Calculate the percent composition of copper in the hydrate CuSO4.5H2O based on atomic weight data.
Using Thermodynamic data from your notes, calculate the change in Gibbs free energy for each of the following reactions using Gf's. In each case indicate whether the reaction is spontaneous under standard conditions.
The length and width of the settling tanks (two rectangular units are desired with a length to width ratio of 3:1). Assume the average depth of the tank is 4m.
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