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A white substance was known to be either magnesium hydroxide, calcium hydroxide, or zinc oxide. A 1.78 g sample of the substance was mixed with 50.0 mL of water and 100.0 mL of 0.731 M HCl was added. The mixture was stirred, causing all of the sample to dissolve. The excess HCl in the solution required 94.9 mL of 0.128 M NaOH for complete neutralization in a titration. What was the molecular formula of the white substance?
Calculate the partition coefficient of caffeine between water and each of the other three solvents. Which of these three organic solvents would be the best choice for extracting caffeine from an aqueous solution?
If 17.8 grams of KOH dissolve in enough water to make a 198-gram solution, what is the concentration in percent by mass.
An ordinary vapor compression refrigeration cycle using R134a is to operate with a condenser at 45 C and an evaporator at -10 C. The compressor is 80% efficient.
This reaction is a catalytic hydrogenation that only partially reduces an alkyne. Consider whether the hydrogenation
If you have a sample of 2.5 mol of Fe2(SO4)3, how many mol of sulfate ion do you have
The ice was poured out into another container leaving a wet, empty beaker that weighed 46.146g. How much ice was poured into the other container?
How many gms of H2O must be combined to 519.5 gms of methanol at 20°C to have an osmotic pressure of 408 mm of Hg? Methanol density = 0.8921 g/mL.
50.0mL of 0.15 M cobalt(II) nitrate is diluted to 250 mL with water. What is the final concentration of cobalt(II) nitrate
calculate acidic and basic buffer capacity. How much of strong acid should be added to shift buffer pH one unit down, and how much of the strong base is needed to bring buffer pH one unit up?
Do you use the same type of glassware when making solutions of varying molarity? Should you use a volumetric pipette or flask
Suppose a solution contains aqueous Hg2(NO3)2 . Write complete ionic equation to show the reaction of aqueous Hg2(NO3)2 with aqueous sodium chloride to form solid Hg2Cl2 and aqueous sodium nitrate. Express your answer as a chemical equation. Ident..
Ammonia reacts with diatomic oxygen to form nitric oxide and watervapor. When 40.0g of ammonia and 50.0 g of oxygen are mixed and allowed to react, which is the limiting reagant? 4NH3 +5O2--> 4NO + 6H2O
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