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If 6.06 L of O2 gas is collected over water at 250C (vapor pressure = 23.8 torr) and a barometric pressure of 702 torr, what is the mass of H2O2 (MM = 34.02 g/mole) decomposed?
The reaction of peroxydisulfate ion (S2O8)2- with iodide ion (I-)is, S2O82-(aq) + 3I-(aq)= 2SO42-(aq) + I3-(aq) From the following data collected at a certain temperature, determine the rate law and c
A solution is prepared by dissolving 4.21g of a nonelectrolyte in 50.0 g of water. If the boiling point increases by .203C, what is the mass of the solute?
The molar heat of solution of a substance is found to be +35.34 kJ/mol. The addition of 0.20 moles of this substance to 1.5 L water initially at 55. °C results in a temperature decrease. Assume
Phosphorus pentachloride, PCl5, a white solid that has a pungent, unpleasant odor, is used as a catalyst for certain organic reactions. Calculate the number of moles in 38.7 g of PCl5.
Consider the following reaction, equlibrium concentrations, and equilibrium constant at a particular temperature. Determine the equilibrium concentration of SO3(g)
In the reaction between potassium carbonate and calcium nitrate (balanced eq: K2CO3 + Ca(NO3)2--> K2(NO3)2 + CaCO3), why wouldn't ...--->2KNO3 +CaCO3 be right?
A certain first-order reaction () has a rate constant of 7.50×10-3 at 45 . How many minutes does it take for the concentration of the reactant, to drop to 6.25 of the original concentration?
The empirical formula for acetic acid is CH2O. Its molar mass is 60 g/mol. The molecular formula is
The average pH of precipitation in rural areas is 7.00. Assuming that the pH is controlled by the carbonate system, i.e., no anthropogenic acid gases are present in the atmosphere.
Why is the internal-standard method often used in plasma emission spectrometry?
The filtrate after the removal of the black precipitate was basified with 6M ammonia. This when treated with 3M ammonium carbonate, it gave a white precipitate. This white precipitate was dissolved
Carbon monoxide and water vapor, each at 200. Torr, were introduced into a 250. mL container. When the mixture reached equilibrium at 700.°C, the partial pressure of CO2(g) was 88 Torr. Calculat
Q: Once the solvent front reaches the top of the chromatographic paper, solvent begins to evaporate from the top edge of the paper and the remaining solvent continues to move up the paper.
Calculate the percentage of empty space in 1 mole of water at 25 c. obbtain the density from the experiment "some measurements of mass and volume." the volume of a molecule of water can be tak
What is the molecular formula of a compound with a percentage composition 26.7% P, 12.1% N, and 61.2% Cl and a molecular mass of 695u.
If a bottle of nail polish remover contains 158 of acetone, how much heat would be released by its complete combustion?
A 67.0-g piece of gold at 725K is dropped into 165 g of H2O(l) at 298K in an insulated container at 1 bar pressure. Calculate the temperature of the system once equilibrium has been reached. Assume
Classify the solid state of the following substances as ionic crystals, covalent crystals, molecular crystals or metallic crystals:
the explosive, TNT, is composed of 37.0% carbon, 2.2% hydrogen, 18.5% nitrogen and the rest oxygen. if the molar mass of TNT is 227 g/mol, what is the empirical and molecular formula for TNT?
Examine the reaction you have written. What will be the effect of decreased pressure on the system on the concentrations of [O2] , [HbO2] and [Hb] in the blood
Calculate the concentrations of all species at equilibrium for each of the following cases.(a) 1.4 g H2O and 2.4 g Cl2O are mixed in a 1.0 L flask.
Exactly 10.0 mL of an unknown sample of Ni2+ gave a current of 2.36 ?A. After 0.500 mL solution of 0.0287 M Ni2+ was added to the 10.0 mL sample, the current increased to 3.79 ?A. What is the concentr
Write the net ionic equation for any precipitation reaction that may be predicted by the solubility rules on the information page, when aqueous solutions of iron(III) nitrate and sodium sulfate are
The reactant concentration in a first-order reaction was 6.80×10-2 M after 10.0 s and 4.40×10-3 M after 65.0s. What is the rate constant for this reaction?