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How many moles of N2 molecules are present in a 0.151 L sample of dry air at 0.0356 atm and 23.8 °C ? (The mole fraction of N2 = moles of N2 / total moles of dry air = 0.7809.)
If the wave functions describing the 2s and two of the 2p orbitals are combined, the identical orbitals form bond angles of what degree?
An oligomeric protein has a molecular weight of 168000. A 420 mg sample was treated with an excess of 1-fluoro-2,4-dinitrobenzene (Sanger\'s reagent) until the reaction was complete
Using standard reduction potentials, calculate the standard E0 cell, (emf), for each of the following reactions. 1. Show half reactions
The student incorrectly lists the species in solution as H+, C+4, O-2. Give the correct list of species in the solution.
A 4.50-g sample of LiCl at 25.0C dissovles in 25.0mL of water also at 25.0C. Th final equilibrium temerpature of the resulting solution is 60.8C
the concentration of mud in the dirty stream from the settling basin to the lagoon is 4000 mg/L. Calculate the flow rates of the two discharge stream (L/s) that exit from the settling basin.
The mercury in a .8142g sample was precipitated with excess of H5IO6. The precipitate was filtered and washed free of the precipitating agent, and .4114g was recovered. Calculate the % of Hg2Cl2 in the sample
a lake in central texas contains 5.0 billiion liters of water. the pH is normally 6.4, but it is tested at 5.6. how much CaCO3 should be added to bring the pH to a more reasonable 6.0?
A gaseous reaction occurs at a constant pressure of 50atm and releases 61.5kJ of heat. Before the reaction, the volume of the system was 7.00L. After the reaction, the volume of the system was 2.60L.
Calculate the volume the gas will occupy if the pressure is increased to 1.87 L while the temperature is held constant.
Which of the following will have the lowest freezing point?
A sample of of H2O with a mass of 46.0 grams has the temperature of 100C ,how many jolues of energy are necessary to boil the water.
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