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The amount of nitrogen in an organic substance can be determined by an analytical method, called the Kjeldahl method, in which all the nitrogen in the organic substance is converted to ammoinia. The ammoinia, which is a weak base, can be neutralized with hydrochloric acid , as described by the equation
NH3 (aq) + HCl (aq) ---> NH4Cl (aq)
If 80.0 mL of 0.150 M HCl (aq) is needed to neutralize all the NH3(g) from a 2.25G sample of organic material.
Calculate the mass percentage of nitrogen in the sample.
When extracting caffeine from tea why do you have to use cold NaOH and water vs. room temperature
Calculate the percent by mass of aluminum in the sample. The vapor pressure of water at 20 degree C is 17.5 Torr.
Provide the newman projections across the C 2 -C 3 bonds for the major conformers after Drawing the zig-zag structures of all the isomers of 2,3-diaminopentane.
How many moles of Na2SO3 were added to the calorimeter cup if 30.0mL 0.50 M NaOCl and 70.0mL 0.50 M Na2SO3 were combined?
What are the differences between sub-energy levels and orbitals? (My professor said they were different.)
calculate the theoretical yield of TiO2. If the percent yield of the reaction is 77.6%, how many grams of TiO 2 are actually formed?
chromium oxide is made by reacting Na2Cr2O7 with ammonium chloride to make chromium III oxide, sodium chloride, nitrogen and water.
in a titration, 33.21 ml 0.3020 M RbOH solution is required to exactly neutralize 20.00 ml hydrofluoric acid solution. what is the molarity of the hydrofluoric acid solution.
How much heat is required to warm 221 g of ice from -44.7°C to 0.0°C, melt the ice, warm the water from 0.0°C to 100.0°C, boil the water, and heat the steam to 173.0°C?
What are the molar enthalpy and total enthalpy of the pure system when 50% and 75% have been evaporated at: (i) 30°C, (ii) 50°C? Use liquid at 25°C as a reference state
A flask contains 0.350 grams of liquid Br( bromine). calculate the number of (Br)bromine molecules present in the flask
Some of the cyclohexane solvent vaporized during the temperature versus time measurements. Will this loss of cyclohexane result in the freezing point of the solution being recorded as too high
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