Copper(II) acetate containing 6Cu is used to study brain tumors. This isotope has a half-life of 12.7 hours. If you begin with 25.0 ug of "Cu, what mass remains after 63.5 hours?
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- An IV of 650cc of 5% dextrose contains how many grams of 5% dextrose?Quinine ( C20 H24 N2 O2) is the most important alkaloid derived from cinchona bark. It is used as an antimalarial drug. For quinine, pK, = 5.1 and pK, = 9.7 ( pKp = – log Kp). Only 1 g quinine will dissolve in 1920.0 mL of solution. Calculate the pH of a saturated aqueous solution of quinine. Consider only the reaction | Q+ H2O= QH+ + OH- described by pK, where Q = quinine. pH =Propanamide and methyl acetate have about the same molar mass, both are quite soluble in water, and yet the boiling point of propanamide is 486 K, whereas that of methyl acetate is 330 K. Explain.
- Ethylene oxide is produced industrially from the reaction of ethylene with oxygen at atmospheric pressure and 277 oC, in the presence of silver catalyst.C2H4(g) + O2(g) → C2H4O(g) (unbalanced)Assuming 100 % yield, how many kg of ethylene oxide can be produced from 34600 L of a mixture containing ethylene and oxygen in 1:1 molar ratio?59. An assay for ergocalciferol calls for the dissolution of 0.5 mg of ergocalciferol with chloroform up to 5 mL, and the ad- dition of 0.3 mL of acetic anhydride and 0.2 mL of sulfuric acid. Calculate the ratio strength of ergocalciferol in the mixture. 59. 1:11,000 w/v ergocalciferolTirofiban (C22H36N₂O5S MWt = 440.6) is present as tirofiban HCI monohydrate (C22H36N2O5S.HCI.H₂O MWt=495.1) at 0.281 mg/mL in a concentrated solution. A solution for infusion is prepared by extracting 50 mL from a 250 mL bag of 5% glucose solution and adding 50 mL of concentrated solution. Sofia who weighs weighs 87 kg requires a tirofiban dose of 0.1 mcg/kg/min for 12 to 24 hours. What would the infusion rate be (mL/h)? (Answer to 1 decimal place.) Answer:
- The molar stability of mercury (II) sulfide is below. What is the Ksp ?Given: 2KI +Pb(NO3)2 --> PbI2 + 2KNO3. How many grams of lead (II) iodide are produced if 0.250 moles of potassium iodide react completely? Group of answer choices 0.125 g 0.250 g 57.6 g 115 gYou have just used up the last of a 1.2 % m/m solution of agarose in water. You require another 100mls. How many grams of Agarose do you require? Note 1ml of water=1g What is the % w/v of a 100ml solution containing 5g of NaCl?
- Cocaine (C17H21O4N; Figure 2) is a natural substance found in leaves of the coca plant, which have been used for centuries as a local anaesthetic and stimulant. Illegal cocaine arrives in the USA either as the pure compound or as the hydrochloride salt (C17H21O4NHCl). At 25oC, the salt is very soluble in water (2.50 kg/L), but pure cocaine is much less so (1.70 g/L)What is the maximum amount of the salt (in gram) that can dissolve in 50.0 mL of water?When a 25 mL aqueous solution that contains 62.50 g of the salt is treated with NaOH, the salt is converted to pure cocaine. How much water (in litres) is needed additionally to dissolve the formed pure cocaine?MD ordered morphine SO4 gr 2/5 and the pharmacist has a stock solution of gr 1/8 per milliliter of morphine SO4. How many milliliters of the stock solution is required to fill the Rx?A 0.578-g saltwater sample was titrated with 1.864 g AgNO3 solution to reach the endpoint of the reaction. Calculate the following by showing all necessary solutions: 1. mol AGNO3 if the AGNO3 solution was prepared by dissolving 5.0 g of AgNO3 in distilled water until 100 ml is reached. (MW AgNO3 = 169.87 g/mol) 2. % Cl in the saltwater sample (MM CI = 35.45 g Cl /mol CI" )