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A piece of iron wire of mass 2.225g was put into a conical flask containing dilute sulphuric acid. The flask was fitted with a bung carrying a Bunsen valve, to allow the hydrogen generated to escape but preventing air from entering. The mixture was warmed to speed up the reaction. When all the iron had reacted, the solution was cooled to room temperature and made up to 250cm^3 in a graduated flask. With all these precautions, iron is converted to Fe^2+ ions only and no Fe^3+ ions are formed. 25.0cm3 of the solution were acidified and titrated against a 0.0185 mol/dm^3 solution of potassium dichromate (VI). The volume required was 31.0cm^3. Calculate the percentage of iron in the iron wire.
How many moles of steam are produced at 2.00 atm and 202.0 degrees celcius by the complete combustion of 12.50 L of methane gas?
what is the velocity of a first-order reaction when the reactant concentration is 6 x 10-2 m and the rate constant is 8
Consider the combustion of ethylene, . If the concentration of is decreasing at the rate of 4.2×10?2 , what is the rate of change in the concentration of
What is the mass of a rectangular piece of copper 24.4cm x 11.4cm x 6.6cm? The density of copper is 8.92 g/cm^3.
CHEM 354 Extended Problems, The variation of EMF for the cell below with temperature is shown in the graph below.
If an athlete weighs 133lb and has 15.0\% body fat by weight, how many pounds of fat does the athlete's body contain
Calculate the molar solubility of AgCl in a solution made by dissolving 10.0 g of CaCl2 in 6.00 L of solution
What is the molarity of a solution made by dissolving 2.355g of sulfuric acid in water and diluting to a final volume of 50.0 mL
Write a Lewis structure for each of the following molecules.
a hypothetical metal has a face-centered cubic unit cell and a density of 6.12 gcm3. the molar mass of the metal is
The reaction between hydrochloric acid and zinc metal produces hydrogen gas and zinc chloride. If 50g of each hydrochloric acid and zinc are mixed
At 200 K, the rate constant for the reaction of NO with ozone to give NO2 and O2 was found to be 1.3 x 106 L/mol•s. At 300 K, the rate constant increased to 9.9 x 106. Calculate the activation energy for the reaction in kJ/mol
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