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Suppose a lake has T=30 degrees C and an O2 concentration of 0.7mg/L, and 1.5mg of carbon (as CO2) is converted by photosynthesis to organic biomass (CH20) during one day under these conditions. A.) Calculate O's aqueous solubility in surface waters of this lake. B.) Will the amount of O2 produced by photosynthesis cause O2's aqueous solubility to be exceeded in 1L of this lake water? If yes, how much? C.) If your answer to part B is yes, then what volume of lake water would be saturated with O2 if you include the O2 produced by photosynthesis?
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?
Calculate the entropy change for each of the following reactions. Justify why these are physically reasonable answers.
How many grams of NaCl are contained in 350 ml of a 0.25 M solution of sodium chloride?
In a titration, 25.0 mL of 0.154 M HCl was added to 45.0 mL of 0.213 M ammonia (NH3). What is the pH at this point? (Kb of NH3 = 1.8 × 10-5 )
All of the sulfate ion is in the precipated as barium sulfate. the mass of Barium Sulfate 0.5032g . What is the average mass of saccharin per tablet ? What is the % mass of saccharin per tablet?
Determine the [H+] and the pH of a buffer containing 0.20 M acetic acid and 0.10 M sodium acetate. 2. Calculate the percent dissociation of acetic acid in this solution
2 NH3 + CH3OH → products . How much NH3 is needed to react exactly with 21 grams of CH3OH
Blending of two wines with different concentrations of acid, Two wines are available for blending: One tank of 1000 L has a Titratable Acidity of 9.0 g/L and another tank containing 2000 L has a Titratable Acidity of 0.6 g/L.
For the unbalanced equation Cl2 ++ KI = I2 + KCl - how many moles of the second reactant would be require to react exactly with the 0.275 mole of the first reactant
Specify whether a simple distillation or a fractional distillation would be more suitable for each of the following purifications, and briefly justify your choice.
Calculate the pH of a buffer formed by mixing 95 mL of 0.13 M lactic acid with 85 mL of 0.15 M sodium lactate.
An excess sample of solid Ag2SO3 is added to 100 mL of water. After equilibrium is achieved between the solid and its aqueous ions the silver ion concentration is found
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