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Separate a mixture of alkanes. Which HPLC mode will you choose and why? Consider: Normal-phased, reverse-phased, ion-exchange, and size-exclusion).
How long will it take for 75% of nitrogen dioxide to decompose if the initial concentration of nitrogen dioxide is 1.33M
A sample of vapor occupies a volume of 125 mL at 100 degrees C and 748 torr. What is the volume of the same sample under STP conditions?
A 0.9092-g sample of wheat flour was analyzed by the Kjeldahl procedure. The ammonia formed was distilled into 50.00mL of 0.05063 M HCl; a 7.46-mL back-titration with 0.04917 M NaOH was required. Calculate the percentage of protein in the flour.
a sample of mgcl2 is known to be contaminated with nacl. a 3.47-g portion of the sample is dissolved in water and
Calculate the solubility of KBR at 23'C. Assume that the solubility increases by an equal ampunt od degrees between 20'C and 30'C
Calculate the value of E°cell for a voltaic cell described in each of the following. Enter your answer with 3 significant digits. Enter scientific notation as 1.23E4.
A student prepared a solution by dissolving 0.4351±0.0002 g of NaCl (formula mass of NaCl is 58.443±0.002g/mole) in 997.33±0.03ml of water. Then, he accidently added 5.21±0.02ml of water into the solution.
Calculate the heat energy released when 19.6 g of liquid mercury at 25.00 °C is converted to solid mercury at its melting point.
How many grams of FeSO4.(NH4)2SO4.6H2O (MW = 392.14) must be dissolved and diluted to 250.0 mL to prepare an aqueous solution that is 10.00 ppm Fe2+ by weight (1.00 ppm = 1.00 mg/L)
a solution of ammonia and water contains 4.00×1025 water molecules and 8.20×1024 ammonia molecules. How many total hydrogen atoms are in this solution?
Assuming that Hf and S values are independent of temperature, determine theoretically at what temp,T, will this reaction become spontaneous at standard conditions
you have 100 mL graduated cylinder containing 50 mL of water. you drop a 154 g piece of brass (d= 8.56 g/cm3) into the water. how high does the water rise in the graduated cylinder?
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