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The rate constant for a reaction increases by a factor of 1.41 when the temperature is increased from 20 °C to 27 °C. What is the activation energy of the reaction
considering the given equation as 2fe2o3s 3cs rarr 4fes 3co2g and compute w when 181 grams of iron iii oxide mm
Calculate the freezing point of a solution that contains 30.0 g of urea, CH4N2O, in 200. g of water. Urea is a nonvolatile nonelectrolyte. Kf for H2O = 1.86°C/m.
The combustion reaction of propane, C3H8, in the presence of molecular oxygen, O2, is an equilibrium reaction that produces carbon dioxide and water. Express the equilibrium constant for this reaction.
the leathal inhalation does of sarin for a 200 pound person has been determined to be .0015mg. determine the ld50 of
determine the concentrationof the original HCl acid solution in units ofa) Molarityb) Percent by mass (Hint: refer to Skill Builder 6 to see the relationship between molarityand percent mass units
Rate data for an enzyme-catalyzed reaction and constructed a Lineweaver-Burk plot. The best-fit line had a slope of 2.3 minutes and a y-intercept of 4.7 x 10^4 min/M. Calculate Km and Vmax.
What is the molar mass of the compound? Express your answer to two significant figures and include the appropriate units
the instrument response S for each of the five solutions, measured with a colorimeter, was found to be 0.240, 0.437, 0.621, 0.809, and 1.009, respectively. What was the concentration of Fe3+ in the water sample?
A buffer contains equal amounts of a weak acid and its conjugate base and has a pH of 5.25. Which of the following values would be reasonable to expect for the pH after addition of a small amount of HCl
The density of magnesium oxide is 3.58 g /cm3. Given that the radius of the O2- ion is about 140 pm in most oxides, calculate the radius of Mg2+, in pm. Your solution should include a sketch one face of the unit cell of MgO to show how the edge le..
Using the table of polyatomic ions, write the correct chemical formula for the following ionic compound. Use the Solubility Rules to write the dissociation equation when the ionic compounds are placed in water.
A metal-plating waste contains 20mg/L Cu2+, and it is desired to add Ca(OH)2 to precipitate all but 0.5mg/L of the copper. To what concentration in moles per liter must the hydroxide concentration be raised to accomplish this? Ans: 1.6*10^-7 mol/L
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