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A 25.0 mL sample of river water was titrated with 0.0010 M Na2Cr2O7 and required 8.3 mL to reach the end-point. What is the chemical oxygen demand, in milligrams of O2 per liter, of the sample?
Given that is the central atom, draw a Lewis structure of in which the formal charges of all atoms are zero. Draw the molecule by placing atoms on the grid and connecting them with bonds. Include
Compute the change in temperature when 1.8 g of sodium chloride is dissolved in 300.0 mL of water initially at 20C. The heat capacity of water is 4.184 J/mL/K. Neglect the heat capacity of the NaCl.
A sample of neon has a volume of 610 mL when it is at a pressure of 867 mmHg. What will be the volume when the pressure is increased to 1760 mmHg.
If gasoline is selling for $3.20/gal, what would the price of ethanol have to be in order to provide the same amount of heat per dollar? The density and delta H defrees F o octane are 0.7025 g/ml an
A solution initially 0.100 M in HOCl and 0.300 M in NaOCl. What is the pH in 0.030 mol of solid NaOH is added to 1.00 L of this solution? Assume no volume channge.
If 1g of pyrrole and 1g of benzaldehyde are reacted with acid catalyst to form tetraphenylporphyrin, what is the theoretical yield?
What is the explanation for this observation and what laboratory studies mimic these results? Why do you think this doesnt occur for all infectious diseases?
A solution is made by dissolving 21.5 grams of glucose (C6H12O6) in 255 grams of water. What is the freezing-point depression of the solvent if the freezing point constant is -1.86 °C/m?
Which hydrolysis product would arrive first at the detector of a TOF mass spectrometer using electrospray ionization from an acidic solution to volatilize and charge the peptides? Explain why.
Which of the following ethers has the highest boiling point?
A beaker with 115 of an acetic acid buffer with a pH of 5.00 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 . A student adds 9.00 of a 0.430 solution
22.5ml of .383 molar H2SO4 is required to completely neutralize 20ml of KOH solution. What is the molarity of the KOH solution?
How much heat is given off when 25.6 g of ethyl acetate is burned in excess oxygen? 650. kJ The burning ethyl acetate from the previous question is used to heat 4.0 L of water at 21.3°C
When 157mg of dipentylamine was added to 122mg of benzoic acid and 2 mL of water, a completey homogenous solution was formed. Draw the structures of the species present in water.
If these products are separated by DEAE-ion-exchange chromatography at pH 7.0, in what order will the products emerge from the column? Explain Why.
calculate the molarity of an aqueous NaOH solution if 32 mL of it is required to titrate .6789 grams of oxalic acid to a phenolphthalein end point.
Calculate the mass of nitrogen dissolved at room temperature in an 99.0 {rm L} home aquarium. Assume a total pressure of 1.0 {rm atm} and a mole fraction for nitrogen of 0.78.
A sample of sodium reacts completely with 0.142 kg of chlorine, forming 234 g of sodium chloride. What mass of sodium reacted?
What are ΔH°´ and ΔS°´ for this binding reaction assuming that they are constant over this temperature range? Is this amino acid binding driven by entropy or enthalpy?
When 355g or Bi2O3 reacts with excess carbon, (A) how many moles of Bi2O3 react? (B) how many moles of Bi form?
Give a physical interpretation of equimolar counter diffusion.
How much energy in joules does it take to raise 25.0g of liquid ethanol at 25.0°C to 78.0°C and then evaporate? Ethanol has a latent heat of fusion of 109 J/g and a latent heat of vaporization
What mass of oxygen should be placed in the calorimeter? Assume that a 10-fold excess of Oxygen is used to ensure complete reaction. How much energy is released by the experiment?
If 3.25 L of ammonia react with an excess of oxygen to form nitrogen monoxide and water steam, what volume of water steam will be produced? The pressure and temperature stay constant.