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The activation energy for a reaction A → B is 118.0 kJ/mol. Suppose that the frequency factors for the catalyzed and un-catalyzed reactions are identical.
At 154.4°C a 72.2 g sample of copper is added to an insulated vessel containing 165.0 mL of an unknown hydrocarbon at 22.7 °C whose molar mass is 134.1 g/mol and density is1.26 g/mL.
Determine the mass of FeO and Fe2O3 in the original sample. You are given 10.00 grams of a mixture of FeO and Fe2O3. Complete reduction of this mixture yields 7.58 grams of pure Fe.
Calculate the H+ and pH of 100ml of 0.1M Acetic Acid (pKa = 4.76) after you add 50 ml of 0.1M NaOH to it? Determine the concentration of OH in the mixture?
Suppose a coal fired electric plant consumes 3.5 million liters of oil per day, that the oil has an average composition of C18H34and having the density = 0.85g/cm^3, and that the gas emitted from th
Determine the limiting reagent? Determine the theoretical yield? Determine the percent yield if the actual yield is 386.0 g of CO2.
Write down a balanced equation for the reaction of molecular oxygen and phosphorus on the basis of this empirical formula.
Suppose you are carrying out a re-crystallization and you add too much solvent. What can you do to obtain the procedure back on track?
Suppose a density of water of 1.0 g/ml; Explain how would you prepare 200 ml of a 5.0wt% aqueous solution of sodium hydroxide?
When 50.0 g of SiO2 is heated with an excess of carbon, 32.2 g of SiC and some CO gas are formed. How can balance the equation.
Determine the numbers of moles of KClO4 are formed? Determine the numbers of moles of KCl are produced?
Heating 2.40 g of the oxide of metal X where the molar mass of X=55.9g/mol in the carbon monoxide yields the pure metal and carbon dioxide. The mass of the metal product is 1.68g.
Identify how many molecules PCB or breath a human in hales in a given town. Where the flux of PCBs is 50μg/m^2 year, Area of town = 100mile^2, deposition velocity of PCBs = 0.3cm/s, and
An air plane springs a leak while in flight; air in the cabin is 22oC and 0.8 bar, pressure escapes to the outside, where the pressure is 0.15 bar. Suppose the expansion is adiabatic, calculate the
Solutions of silver nitrate and sodium carbonate react to form solid silver carbonate and a solution of the sodium nitrate. A solution having 3.50 g of sodium carbonate is mixed with one h
Determine the relation between the strength of the acid and the pka of an acid? Calculate the pka. For an acid HA, the concentration of HA and A- are 0.075 and 0.025, respectively, at pH 6.0.
Calculate the percent by mass of cuso4 * 5H20 in the mixture when a mixture of cuso4 * 5H2O MgSO4 * 7H2O is heated until all the water is lost if 5.020 g of the mixture gives 2,988 of the anhydrous
Calculate the percent yield of a reaction in which 282 g phosphorus trichloride reacts with excess water to form aqueous phosphorus acid (H3PO3) and 119 g HCl?
A reaction combines 133.484 g of lead (II) nitrate with 45.010 g of sodium hydroxide. Pb(NO3)2 (aq) + 2NaOH (aq) Pb(OH)2 (s) +2NA
The combustion of 135mg of a hydrocarbon produces 135mg of H2O and 440mg of CO2. The molar mass of the hydrocarbon is 270 g/mol. Calculate the molecular formula of this compound.
Determine the number of grams of water were in the sample if a 45g piece of ice at 0^celcius is added to a sample of water at 8^celcius. All of the ice melts and the temperature of the water decrea
A sample which is having of 70.5mg of potassium phosphate is added to 15.0L of0.050M silver nitrate resulting in the formation of a precipitate.
What is the maximum number of moles and grams of H2S that can form when 145 g aluminum sulfide reacts with 129 g water?
Determine the fraction of CH4 in the mixture when a mixture of methane (CH4) and ethane (C2H6) of mass 13.43 g is totally burned in the oxygen. If the total mass of CO2 and H2O formed is 64.84g.
Discuss why is ethanol a bad choice for re-crystallizing ophthalmic acid? Why should water be used instead?