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The concentration of a cytostatic drug, cyclophosphamide, in urine was determined by GC/MS/MS. The component of interest in a 5.00 mL aliquot of urine was extracted with 20 mL of diethylether. The extract was then reduced in volume, spiked with a known amount of internal standard and diluted to 10 mL in a volumetric flask. Analysis of the sample gave a peak-area ratio (Aanal/Aint std) of 0.51. A series of calibration standards containing the same amount of internal standard as the sample were prepared and analysed with the sample. The results are tabulated below:
Cyclophosphamide (µg/L); Aanal/Aint std
5; 0.2010; 0.4015; 0.6120; 0.85Sample; 0.51
Hydrogen sulfide is a common and troublesome pollutant in industrial wastewaters. One way to remove H2S is to treat the water with chlorine, in which case the following reaction occurs
rate constant for the decomposition of N2O5 to NO2 and O2 at 70 degree celsius is 6.82 x 10^-3 s-1. Suppose we start with 0.300 mol of N2O5(g) in a .500L container. What is the half-life of N2O5 at 70 degrees celsius?
a sample of argon gas is at a pressure of 1.24x10^4 kpa and a temperature of 24c in a rigid 25-L tank. How many moles of argon does this tank contain?
How much heat in kJ is absorbed when 63.7 g H2O at 100C is converted to steam at 100C?
Nitrogen and oxygen form an extensive series of at least seven oxides with the general formula NxOy. One of them is a blue solid that comes apart, reversibly, in the gas phase. It contains 36.84% N. What is the empirical formula of the oxide
Consider the following chemical equations: A) Fe2O3(l) + Al(l) ---> Fe(l) + Al2O3(s) If 25.0 g of molten iron(III) oxide reacts with 475 g of aluminum, what is the mass of the iron produced. B) Al(OH)3(s) + H2SO4(l) ---> Al2(SO4)3(aq) + H2O(l) If ..
200 drops of 0.025 M NaF solution and 100 drops of 0.025 M Ba(NO3)2 solution are mixed. a.) write the equation for the formation of solid BaF2.
A 0.411g sample of powdered copper mixed with an inert, soluble additive was fully consumed by 23.4ml of 0.602M nitric acid, producing copper(II) nitrate, water and nitric oxide (NO) gas. What was the percent copper (by mass) in the sample
What is the millimolar concentration of dissolved oxygen for a lake or stream under the partial pressure of oxygen and a temperature of 12?
HClO is a weak acid (Ka = 4.0 × 10-8) and so the salt NaClO acts as a weak base. What is the pH of a solution that is 0.077 M in NaClO?
You need to prepare 100.0 mL of of buffer solution of pH=4.00 using 0.10M benzoic acid (pKa=4.20) and 0.160M sodium benzoate. What is the volume of each solution needed to prepare this buffer?
Calculate the ph of a solution formed by mixing 100.0ml of .20 M HCLO with 200.0 ml of .30 M KCLO. the ka for HCLO is 2.9x10^-8
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