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Question: In the Dumas method for determining nitrogen content in organic compounds, a sample is treated with CuO at high temperature. The nitrogen is converted to N2(g) and collected. given that 350-mg same yields 42.2 ml N2 at STP, calculate the percentage of nitrogen in the sample.
A feed containing 15% by weight of solids is to be concentrated to 40 % solids using a double effect backward feed evaporator. The first effect is heated by steam at 413 K.
Which reaction responds more strongly to changes of temperature, one with an activation energy of 52 kJ mol-1 or one with an activation energy of 25 kJ mol-1
If you look at a reaction equation for an esterification reaction, you cannot tell where the oxygen comes from (acid or alcohol). Knowing the mechanism of this reaction, devise an experiment using O18, to help prove unequivocally where the oxygen ..
Consider the reaction: 2H2S(g)==2H2(G)+S2(g) An equilibrium mixture of this reaction at a certain temperature was found to have = [H2S]=0.602 , [H2]= 3.24×10^?2M , and [S2] = 7.84×10^?3 M. What is the value of the equilibrium constant at this temp..
Based on electronegativity trends in the periodic table, predict which of the following compounds will have the greatest % ionic character in its bonds. a. H2O b. LiI c. CaO d. RbF e. HCl
The stock solution of KMnO_4 has a concentration of 2.6 X 10 ^ -4M. The pipette has a volume of 10.0mL. What is the amount of KMnO_4 delivered to the solution, in moles
How many g of ethanol do I need to burn in excess oxygen in order to recover 5.0 g of water if the reaction has 75% yield
Vanillin is the substance whose aroma the human nose detects in the smallest amount. The threshold limit is 2.0 x 10^-11 g per liter of air. If the current price of 50.0 g of vanillin is $103 determine the cost to supply enough vanillin so that th..
Calibration standards. Transfer 1.00, 5.00, 10.00, 15.00 and 20.00 mL aliquots of 10ppm F- solution to 100 mL flasks. Add 50 mL of TISAB containing CDTA to each
Therefore an answer in U.S. customary units, such as miles per hour would not be accepted as correct. A car traveling with constant speed travels 150 km in two hours. What is the speed of the car?
An unknown compound X, is thought to have a carboxyl group with a pka of 2.0 and another ionizable group with a pka between 5 and 8. When 75 ml of 0.1 M NaOH was added to 100 ml of a 0.1 m solution of X at pH 2.0, the pH increased to 6.72.
determine the minimum concentration of the percipitation the cation from the solution of the left. 0.035 M BaNO3; Naf.
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