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The following results were obtained for the determination of calcium in a NIST limestone sample: % = 50.31, 50.22, 50.38, 50.19, and 50.45. Five gross samples were then obtained for a carload of limestone. The average percent values for the gross samples were found to be 49.46, 50.11, 49.62, 49.76, and 50.30. Calculate the overall relative standard deviation, the relative standard deviation of the method, and the relative standard deviation of the sampling process.
If 155 of wet is collected over water at 24 and a barometric pressure of 738 , how many grams of have been consumed? (The vapor pressure of water is 22.38 .)
The initial mass of the crude ether was 141mg. The mass after recrystallization was 121mg. Calculate the percent recovery from recrystallization.
How many milliliters of 0.105 M HCl are needed to titrate each of the following solutions to the equivalence point:-- 45.0 mL of 0.0950 M NaOH
Limestone (CaCO3) is used to remove acidic pollutants from smokestack flue gases. It is heated to form lime (CaO), which reacts with sulfur dioxide to form calcium sulfite
How much water must be added to 534. mL of 0.180 M HCl to produce a 0.135 M solution? (Assume that the volumes are additive.)
The di basic compund B(pkb1=4.00),pkb2=8.00 was titrated with 1.00 M HCl. the intial solution of B was 0.100M and had a volume of 100.0mL. A) At what volumes are the two equivalence points?
Assume the total heat capacity of the air C air=30 J/K. Describe what's the likely ice will ne after the system reaches equilibrium. b) Estimate theliekly final temperature after reaching equilibrium
The normal boiling point of liquid propanol is 371 K. Assuming that its molar heat of vaporization is constant at 43.9 kJ/mol, the boiling point of C3H7OH
in one experiment .886 mole of NO is mixed with .503 mole of O2. calculate which of the two reactants is the limiting reagent . calculate also the number of moles NO2 produced
Starting with needed alkanes, alkenes and inorganic regrets, devise syntheses for the following compounds. Yout method should produce each compound in good yield and free of isomers.
Adipic Acid (H2C6H8O4) is a carboxylic acid containing compound of industrial importance, notably due to its use during fabrication of nylon. Adipic acid can be titrated using NaOh by the following reaction
A bottle containing 350 g of cleaning solution is used for carpets. If the cleaning solution has a specific gravity of 0.850, what volume of solution was used?
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