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A 1.6664g antimalarial tablet contains the compound quinine. the tablet is dissolved in 0.1 M HCl to give 500 mL of solution. A 15.00 mL ALIQUOT OF THIS SOLUTION IS THEN DILUTED WITH 100.00 mL of acid and fluorescence of this sample is measured. The sample gives a signal of 288 units at 347.5 nm. A standard sample containing 100 ppm quinine is measured under the same conditions and gives a signal of 180 units. Determine the mass of quinine in the tablet.
When 2.20 grams of Cr(CO)6 reacts according to the following equation at 400 °K in a closed system the temperature goes down and 5.2 kJ of hear is absorbed
one can of soda pop is 355 ml. find out the number of tartrazine in milligrams that are utilized while drinking one can
determine the volume of a cube 10,62 cm, give an example of four sets of measurements that illustrate an imprecise and inaccurate data
What is the molecular formula for a substance that contains in 1.00 mole of sample 1.00 mole of S, 24.1 x 10 to the 23rd atoms of F, and 71.0 grams of Cl
find the ph of the solution at the following points in the titration: a) before any base is added b) when half the acetic acid has been neutralized c) at the equivalence pt.
Chemical Syntheis can be characterized as consisting of three basic processes: making chemicals, isolating the products and characterization. Each process is carried out using one or more techniques. Match the following technique with the process.
Calculate the pH of each of the following solutions.
Suppose you were tasked with producing some nitrogen monoxide (a.k.a. nitric oxide). I'm sure this is often requested of you. You can do it by combusting ammonia (be careful!). The equation would be as follows: 4NH3 + 5O 2→ 4NO + 6H2O. If you form ..
A sample of hydrochloric acid contains 7.05 x 10-3 mol of hydrogen chloride in 50cm3 of solution calculate the concentration in mol dm-3 of this hydrochloric acid
We know that temperature affects solubility of gasses in a liquid. As a climatologist, this concept is crucial to understanding changes that are taking place.
Write structural formulas for six, recognizing that the molecular formula may be twice the empirical formula in some of them.
What will be the final temperature of a mixture made from equal masses of water at 24.1 C, ethanol at 37.3 C, and iron at 93.3 C? The specific heat capacities of each are: 0.449J/g C (Fe), 4.18J/g C(Water), and 2.42 J/g C (ethanol).
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