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A 0.300 g sample of an aspirin tablet is used to prepare 100.0 mL of a stock solution by dissolving the tablet in 1 M NaOH then diluting with distilled water to the 100 mL mark of a volumetric flask. A 0.30 mL sample of the stock solution is then transferred to a volumetric flask and diluted with 0.02 M iron(III) chloride to the 10.00 mL mark. The tetraaquasalicylatoiron(III) complex concentration in this 10.00 mL sample is determined to be 4.3x10-4M. What is the percentage of acetylsalicylic acid in the original aspirin tablet? Do not include the % sign in your answer.
Ammonia (NH3) is widely used as a fertilizer and in many household cleaners. How much ammonia is produced when 6.32 mol of hydrogen gas react with an excess of nitrogen gas?Answer in units of mol
The standard molar enthalpy change for this reaction is -1.3MJ. What is the enthalpy change when 6 moles of octane are combusted?
After running the reaction for some time, we collect the product and find a total of 3.1 x 10-3moles of COOH groups. What is the molecular weight of the material? Extent of reaction?
KCL has the same structure as NaCl, the length of the unit cell 638 pm the denstiy of KCl is 1.984 g/cm3 and its formula mass is 74.55 amu. what is avogadro's number?
Solid aluminum acetate is slowly added to 75.0 mL of a 0.0536 M sodium phosphate solution. The concentration of aluminum ion required to just initiate precipitation is
1) If air oxidation of 92.0% iron to ferric oxide is 87.0% efficient, what mass of this iron is required to make 3.00 moles of ferric oxide?
How many moles of PCl_5 can be produced from 21.0 g of P_4 and excess Cl_2?
What is the molarity of a calcium hydroxide solution if a 25.0 mL sample is exaclty neutralized by 42.5 mL of 0.0750 M nitric acid?
calculate the average moles of ascobic acid in the pipetted sample used for titration d)Calculate the average moles of ascobic acid in the crushed tablet.
An electric power station annually burns 3.0 x 10^7 kg of coal containing 2.4 percent sulfur by mass. Calculate the volume of SO2 emitted at STP.
How many grams of sodium sulfide are formed if 1.60 g of hydrogen sulfide is bubbled into a solution containing 2.13 g of sodium hydroxide, assuming that the sodium sulfide is made in 94.0 % yield?
What is the specific heat of a substance that it takes 192 Joules to raise the temperature of 45 grams by 6 degrees Celsius
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