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Inorganic phosphorous is spectrophotochemically measured in blood serum by formation of a reduced heteropoly acid (heteropoly blue) and comparison of its absorbance with a standard treated by the same procedure. If a 1.00 mL blood serum sample gives an absorbance of 0.217, while a 2.00 mL aliquot of a standard containing 91.2 mg KH2PO4 per liter gives an absorbance of 0.285, calculate the milligram percent of P (milligrams per 100.0 mL) in the blood sample. Note: both aliquots are diluted to the same volume prior to absorbance measurements.
Caffeine is made up of 49.5% C, 5.2% H, 16.5%O, and 28.9% N. A solution made up of 8.25g of caffeine and 100.0 of benzene (d=0.887g/ml) freezes at 3.03C.
what is the pH of a solution made by mixing 30.00mL of .10M acetic acid with 40.00 mL 0f .10M KOH? Assume the volumes are additive and Ka=1.8*10^-5 for CH3CO2H
When determining the number of milliliters of mercuring with the density of 13.6 g/mL and having a mass of 501 g, do you divide 13.6 by 501?
A solution of acid is titrated with NaOH. Give the net ionic equation for this reaction. 2. Determine the pH for the following solutions, and identify them as acidic, basic, or neutral.
Carbonate buffers are significant in regulating PH of blood at 7.40. Calculate the concentration of Carbon dioxide in a 0.200M NaHCO3 at PH=7.40.
While shutdown, the core accidentally went critical and the reactor pressure vessel rose in temperature and was hot for two hours, but all instrumentation has failed and no one is sure what the temperature was.
What is the van't Hoff factor for HX in water? b) What is the molality of X1- ions in the solution?
When numbers are very small or very large, it is convenient to either express the value in scientific notation and/or by using a prefix with the unit.
A gas evolved during the fermentation of sugar was collected at 22.5 degrees celsuis and 702 mmHg. After purification its volume was found to be 25.0 L. How many moles of gas were collected?
what is the total pressure in the reaction flask at the end of the reaction? What are the partial pressures of the gases in the flask? 6A(g) + 2B(g) %u2192 2A3B(g)
Calculate the number of grams of Fe formed when 0.100 kg Fe2O3 of reacts.
Hydrogen gas was cooled from 150C to 50 C. It's new volume is75 mL. What was it's original volume?
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