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The electrochemical processes that occur in the rate limiting step of the corrosion of iron (oxidation of iron) are represented by the half-reactions
Fe2+(aq) + 2e-? Fe(s) Eº = -0.44 VO2(g) + 4H+(aq) + 4e-= ? 2H2O(l) Eº = 1.23 V
First, write the overall reaction. What is the standard potential for the overall chemical reaction?
A sample of magnesium sulfate heptahydrate having a mass of 7.35 g. is dried completely. How many grams of dry product are expected to be found
A buffer is prepared by mixing 295 mL of 0.210 M HCl with 584 mL of 0.559 M ammonia (NH3). Given that the Kb of NH3 is 1.8 x 10-5, calculate the pH of the solution.
How many liters of hydrogen gas are collected over water at 20°C and 725 mmHg when 0.75 g lithium reacts with water? Aqueous lithium hydroxide also forms.
A 20.0 mL sample of 0.150 M KOH is titrated with 0.125 M HClO4 solution. Calculate the pH after the following volumes of acid have been added.
Use the data given to calculate an overall energy change (in kilojoules per mole) for the formation of CsF2 from its elements.
Which of these square planar complex ions can have cis-trans isomers. A. [Pt(NH3)2Cl2] B. [Pt(NH3)4]2+ C. [Pt(NH3)Cl3]- D. [Ni(NH3)3Cl]+ E. [Ni(NH3)4]2+
For FeCO3 dissolving in acid solution, the value of Keq is 0.66, calculate the concentration of Fe2+ in a solution obtained by treating solid FeCO3 with 0.315 M HNO3.
The gasoline combines with 340.0 kg of oxygen. What is the total combined mass of the carbon dioxide and water produced by combustion in the engine?
For the cyclohexanes substituted in the positions indicated, identify the substituents as either axial or equatorial in chair conformers. For example, a 1,2-cis relationship means that one substituent must be axial and one equatorial.
What volume of this solution is required to make 1.50 L of 2.75 mol/L NH3(aq)? Give your answer in millilitres, accurate to three significant figures.
What is the total pressure of a gaseous mixyure that contains 3 gases with a partial pressure of 1.2atm oxygen, 0.35 atm carbon dioxide
A solution is prepared by mixing 70.0 mL of 0.010 M BaCl2 and 175 mL of 0.080 M K2SO4. What are the concentrations of barium and sulfate ions in this solution? Assume only SO42- ions (no HSO4? ) are present.
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