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you used the method of standard additions (volume of unknown was 10.0 mL) and fluorescence spectroscopy to measure the amount of quinine (C20H24N2O2, MW = 324.43 g/mol) in tonic water. 1.00 mL of tonic water was added to a 50.0 mL volumetric flask and diluted to the mark with distilled water. A 100 ppm quininesulfate ( MW = 782.97 g/mol) solution was used as the standard. Assuming that your original (undiluted) sample contained 142 ppm of quinine sulfate, calculate the amount in ppm of quinine in the sample.
mixture(O,H) is ignited with a spark and it reacts to form (H2O)liquid water. determine the temperature of water.
An empty beaker weighs 41.19 g. When it is completely filled with water (density = 1.0 g/mL), the beaker weighs 92.92 g.
Calculate the wavelength of the light that is absorbed for the electron's transition from n = 5 to n = 6 in Be3+ ion. (ans in nm.)
A solution is prepared by dissolving 14.7 g ammonium sulfate in enough water to make 100.0 mL of stock solution. A 11.00 mL sample of this stock solution is added to 56.00 mL of water.
How many liters of O2 are needed to react completely with 45.0L of H2S at STP? 2H2S(g) + 3O2(g) -> 2SO2(g) +2H20(g)
Complete combustion of 75.0 g acetylene, C2H2, liberated 3750 kJ of heat
How many mL of a 2.0 M solution of NaOH would bve needed in order to have 0.500 mol of NaOH? (Molar mass of NaOH is 40.0 g/mol)
When the sodium atom becomes a sodium ion, how does the size and electron configuration of the sodium atom change?
the activation energy for the reaction involved in the souring of raw milk is 75kj. milk will sour in about 8 hours at 21 degrees c. how long will raw milk last in refrigeratior maintained at 5 degrees c? assume rate constant to be inversely propo..
If 1.4% of the mass of a human body is calcium, how many kilograms of calcium are there in a 173-pound man?
A solution prepared by mixing 59.5 mL of 0.360 M AgNO3 and 59.5 mL of 0.360 M TlNO3 was titrated with 0.720 M NaBr in a cell containing a silver indicator electrode and a reference electrode of constant potential 0.175 V.
what is the vapor pressure(in mm Hg)of a solution made by dissolving 18.3g of NaCl in 500.0g of H2O at 70 degree celcius. The vapor pressure of pure water at 70 degree celcius is 233.7 mm Hg.
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