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Compute why you must have a liquid flowing back through the fractionating column in order to get the separation of the components during fractional distillation?
A stock solution is prepared by adding 23 mL of 2.1 M Na2SO4 to enough water to make 40 mL. How many moles of Na+ are in 15 mL of the stock solution
Predict the immediate effect of the following changes on the observed cell voltage E.Increased E,Decreased E,No change E.
propane reacts with oxygen in the air to produce carbon dioxide and water. In a particular experiment, 38.0 grams of carbon dioxide are produced from the reaction of 22.05 grams of propane with excess oxygen.
does the oxidation of free fadh2 by ubiquinone under the standard biochemical conditions provide sufficient free energy
Calculate the pH of a buffer that is 0.158 M HClO and 0.099 M NaClO. The Ka for HClO is 2.9 x 10-8
if a pair ofstudents started with 0.12 ml of acetophenone 0.151 g of piperonaldehyde and 0.80 ml of ethanol and added
Using structural formula, how would you write the chemical reaction which explains how the product of the acidification reaction reacts with OH-. How would this explain the changes in solubility?
Conversion of 0.90 g of liquid water to steam at 100 degrees Celsius requires 2.0 kJ of heat. Calculate the molar enthalpy of evaporation of water at 100 degrees Celsius.
a the molar heat capacity of a diatomic molecule is 29.1jkmiddotmol. assuming the atmosphere contains only nitrogen
Sulfuric acid reacts with sodium chloride to form aqueous sodium sulfate and hydrogen chloride gas. How many mL of gas form at STP when 0.117 kg of sodium chloride reacts with excess sulfuric acid?
The decomposition of urea in 0.1 M HCl is first order in urea and first order overall. When [urea] = 0.200 M , the rate at 61.0 °C is 8.56 x 10-5 M/s. What is the concentration of urea in this solution after 4751 s if the starting concentration is..
an unknown solution contains only two absorbing species thymol blue and methylthymol blue. this sample had absorbance
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