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A compound is 40.0% C, 6.70% H, and 53.3% O by mass. Assume that we have a 100.- g sample of this compound. What are the subscripts in the empirical formula of this compound?
Calculate the expected pH of a 25.0 ml solution of 0.200 M acetic acid that is being titrated with a 0.100 M solution of NaOH at any point in the region II of the titration. (Ka of CH3COOH =
The mass of a cube of iron is 324 g. Iron has a density of 7.87 g/cm3. What is the mass of a cube of lead that has the same dimensions?
The half life of a second order reaction in reactant A with an initial concentration equal to 0.200 M is 45.6 sec. What is the second order rate constant (M-1s-1)?
The mass of a cube of iron is 434 g. Iron has a density of 7.87 g/cm3. What is the mass of a cube of lead that has the same dimensions?
Calculate the work done in joules when 50.4 g tin is dissolved in excess acid at 1.04 atm and 20 degrees celsius. assume ideal gas behavior.
How many atoms is 3.87 moles of lithium? how many molecules is 0.342 moles of phosphorus pentachloride? How many moles of oxygen atoms are in 0.634 moles of nitrogen dioxide?
A bottle containing 315 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?
If we add CO2 to increase its concentration to 0.25 mol/L, what will the concentrations of all the gases be when equilibrium is reestablished?
Water, 1-butanol, and catalytic sulfuric acid, a simple distillation is required. what impurities are removed by this distillation?
A 45- piece of ice at 0 is added to a sample of water at 20. All of the ice melts and the temperature of the water decreases to 0. How many grams of water were in the sample?
Write separate oxidation and reduction half reactions for the procedure used in the test for nitrate ions. 3 NO3-(aq) + 8 Al(s) + 5 OH-(aq) + 18 H2O(l)->.
How many 10 liter helium balloons could be filled from the tank assuming no change in the temp and a pressure in the balloons of 1.05 atm?
In a controlled greenhouse at 30.0C and 1.0 atm a crop of seeding tomato plants was found to consume 380 L of carbon dioxide gas during photosynthesis. Assuming 100% yield what a mass of glucose was
She then took 15.0 mL of the stock solution and diluted it with enough water to make 65.0 mL of a final solution. What is the concentration of KOH for the final solution.
how many grams of water can be produced by the reaction of 2.40 mol of C2H2 with 7.4 mol of O2?
what is the theoretical yield of zinc iodide, if a 2.0-g sample of zinc was used with 6.5 grams of iodine.
Consider the titration of 50.00 mL of 0.1000 M HNO2 (Ka = 7.1•10-4) with 0.1000 M NaOH solution. What is the pH after the addition of 15.00 mL.
What does it mean to say that a proton is hydrated, and how will the heat of hydration affect the measured heat flow for neutralization reaction?
If the reaction rate doubles when the temperature is increased to 35 ^circ {rm C}, what is the activation energy for this reaction in {rm kJ}/{rm mol}?
When α-D-xylofuranose is treated with excess methyl iodide in the presence of Ag2O, how many equivalents of methyl iodide react with each equivalent of the furanose?
A graduated cylinder contains 129 of water. A 12.0 piece of iron (density = 7.86 ) and a 15.0 piece of lead are added. What is the new water level in the cylinder?
How many grams of formic acid, HCOOH, must be added to 0.300 L of 0.110 M sodium formate, HCOONa, to yield a buffer solution with a pH of 4.10? Assume no volume change. Ka of HCOOH = 5.0 10-4.
In a gas mixture, the partial pressures are argon 447 mm Hg, neon 77 mm Hg, and nitrogen 144 mm Hg. What is the total pressure (atm) exerted by the gas mixture?