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Twenty dietary iron tablets with a total mass of 22.131 g were ground and mixed thoroughly. Then 2.998 g of the powder was dissolved in concentrated HNO3 and heated to convert all the iron to Fe3+. Addition of NH3 caused quantitative precipitation of Fe2O3 (FW 159.69). What is the average mass of FeSO47H2O (FM 278.01) in each tablet?
The standard free energy of activation of a reaction A is 88.3 kJ mol-1 (21.1 kcal mol-1) at 298 K. Reaction B is one hundred million times faster than reaction A at the same temperature.
What is the molarity of a solution made from 23.1g of NaNO2 dissolved in enough water to make 500ml solution
A 3.026 g portion of a copper(II) salt was dissolved in a 250 ml volumetric flask. a %0 mL aliquot was analyzed by adding 1 g of KI and titrating the liberated iodine with 23.33mL of .046668M Na2S2O3. Find the weight percent of Cu in the salt.
if 25.0 g of a solution of potassium iodide transparent and colourless and 15.0 g of a solution of lead nitrate
Place drying tube filled with CaCl2 on condenser. Heat to reflux at 190 C for 25 minutes then cool. Add 0.5mL tolulene and petroleum ether 0.5-0.75 mL until slight cloudiness remains. Reheat until clear and cool in ice bath. Collect product and wa..
Consider a liquid with a vapor pressure of 200. torr at 20.0 oC and a vapor pressure of 400. torr at 50.0 oC. What is the closest value to the normal boiling point of this liquid. A. 357 oC B. 295 oC C. 22.0 oC D. 18.2 oC E. 83.8 oC
A sample of fresh grapefruit juice was filtered and titrated with the above I2 solution. A 100 mL sample of the juice took 9.85 mL of the iodine solution to reach the starch endpoint.
Calcium supplements commonly contain calcium ions in the form of calium carbonate (CaCO3). If one calcium supplement weights 600. mg, how many moles of calcium are contained in each pill
Consider a solution that is 1.1*10^-2 M in Ba2+ and 2.0*10^-2 M in Ca2+. A - If sodium sulfate is used to selectively precipitate one of the cations while leaving the other cation in solution, which cation will precipitate first? Ba2+ precipitates..
Calculate the experimental value for Ksp for KHP and determine whether it is within 10% of the theoretical Ksp value (solubility = 8.0g/L). If not, give one reason why this error might have occurred.
One mole of hydrogen at 25c and 1 bar pressure is compressed adiabatically and reversible into a volume of 5 L. Assuming ideal gas behavior, calculate
Find out What mass of the NaHCO3 reacts with the vitamin C When the tablet dissolves in H2O, it "fizzes" because the reason for this is the CHO3 reacts with the citric acid(C6H8O7 a weak organic acid) and the vitamin C?
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