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A sample of a mixture of KClO3 and KBr weighing 7.0950 g is heated in the presence of a small amount of MnO2 which acts as a catalyst of the decomposition reaction 2 KClO3(s) --> 3O2(g) + 2KCl(s) .
The O2(g) is collected in a container over water. The total volume and pressure of the gas in the container was 865.5 mL and 741.5 mm Hg respectively at 27.2oC. The vapour pressure of water at that temperature is 27.1 mm Hg. Assume that all of the KClO3(s) decomposed. What was the %w/w of KClO3(s) in the original mixture?
how to predict whether a precipitate reaction will occur when aqueous solutions of PbCl2 and (NH4)2S are mixed.
An aqueous vinegar sample contains 5.4% acetic acid by mass and has a density of 1.006 g/mL. Calculate the amount of acetic acid in grams in 2.00 L of this vinegar. Report your answer using the correct number of signi?cant ?gures.
Draw the correct structure for (3S,4S)-3,4-dimethylhexane. Show stereochemistry clearly. To ensure proper grading, explicitly draw all four groups, including wedge/dash bonds
An sulphuric acid solution has a concentration 3.75 M and a density of 1.230 g/cm3. Determine the molality of the solution.
Caulculate the change in pH when 0.95 g of CH3COONa is added to 48 mL of 0.50 M acetic acid, CH3COOH. Ignore any changes in volume. The Ka for CH3COOH is 1.8 * 10^-5
Draw Lewis structures of the four molecules and/or ions with the formulas given below and figure out which two of these are isoelectronic with each another.
Using the periodic table, arrange the atoms in each of the following sets in order of increasing electronegativity: a) CL, F, Br; b) B, O, N; c) Mg, F, S
When one mole of hydrogen iodide(HI) is stored in a 1-liter container at 444 oC, 22 % of HI wil be dissociated at equilibirum. Calculate the equilibrium constant of the reversible reaction of hydrogen iodide (HI)at 444 oC.
Use standard enthalpies of formation to determine ?Horxn for: 3NO2(g) + H2O(l) ? 2HNO3(aq) + NO(g) Enter in kJ. Find the change in internal energy for this reaction. Enter in kJ.
Draw line-angle structural formulas for 8 constitutional isomers that have a molecular formula C4H8O.
To obtain a 18.0% (w/v) solution of copper sulfate (CuSO4), M.W.=160 when only the crystalline salt is available (CuSO4 5H2O, M.W.=250), what should the crystalline salt be weighed to prepare 450.0mL of solution
Perform a similar analysis of a stripping column. In this case, 100 lbmol/h of water with a concentration of 0.0045 lbmol SO2/ft3 is stripped with air to a concentration of 0.0005 lbmol SO2/ft3. The air flow rate is 1.5 times the minimum.
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