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Serum taken from a patient being treated with lithium for manic-depressive illness was analyzed for lithium concentration. A reading of 332 units was obtained for the intensity of the 671 nm red emission line. Then 1.00 mL of a 10.9 mM Lithium standard was added to 9.00 mL of serum, and this spiked serum gave an intensity reading of 7.10 × 102 units. What is the original concentration of Li in the serum?
Calculate Kb for methylamine. Is methylamine strong base or weaker base than ammonia?
a 25 ml of sample of HNO3 is neutralized by 32.1 ml of 0.150 M KOH(aq). What is the molarity of HNO3?
The density of a 16.0 mass % solution of sulfuric acid in water is 1.1094{g/mL} at 25.0 degrees celcius.
What mass of F2 is needed to produce 167 g of PF3 if the reaction has a 77.0% yield?
The heat of vaporization for the compound is 27.49 kJ/mol. Calculate the heat required to convert 26.78 g C2Cl3F3 from -59.34 oC to 83.11 oC
How much helium gas would it take to ?ll a gas balloon with a volume of 1020 cm 3 when the temperature is 39.0? C and the atmospheric pressure is 724 mm Hg? Answer in units of mol.
Calculate Ea. Express your answer using two significant figures Ea= kJ/mol Calculate A. Express your answer using one significant figure. A = M-1s-1
Calculate the heat energy released when 13.3 g of liquid mercury at 25.00 C is converted to solid mercury at its melting point. Constants for mercury at 1 atm
A sample of cerium-141 for a diagnostic test was dissolved in saline solution to an activity of 4.5 millicuries/mL. If the patient undergoing the test needs a dose of 10 millicuries
Include in your explanation from which C and in what form the H would have to leave: [H+, H(with one electron), H(with two electrons)].
the rate constants of some reactions double with every 10 degree rise in temperature. Assume that a reaction takes place at 305K and 315 K. What must the activation energy be for the rate constant to double as described?
At 20 degrees C the vapor pressure of pure methanol (CH3OH) is 89.0 torr and of pure water (H2O) is 17.5 torr. A solution of methanol and water has a total vapor pressure of 52.9 torr at 20 degrees C.
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