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Calculate the pH during the titration of 20.00 mL of 0.1000 M CH3CH2COOH(aq) with 0.1000 M NaOH(aq) after 20.39 mL of the base have been added. Ka of propanoic acid = 1.3 x 10-5.
What term expresses the ratio of moles of reactants and products according to the coefficients in the balanced chemical equation?
A metal sample weighing 124.10 g and at a temperature of 99.3 C was placed in 42.87 g of water in a calorimeter at 23.9 C. At equilibrium the temperature of the water and metal was 41.6 C.
What is the percent-yield of H2 in the reaction below when an equimolar mixture of CH4 and CO2 with an initial total pressure of 20.0 atm reaches equilibrium at 1200. K, at which Kp = 3.548 x 106
Molecular iodine, I2(g), dissociates into iodine atoms at 625 K with a first-order rate constant of 0.271 s^-1. If you start with 7.0×10?2 M I2 at this temperature
what is the purpose of a buffer system? b)what is the purpose of NaNO2 in the buffer? c)how does the buffer react when some H3O^+ is added? d)how does the buffer react when some OH^- is added?
An unknown element, X, reacts with chlorine to form a compound with the formula XCl2. Which element is most likely to be element X?
Based on formal charges, which statement about the best Lewis structure of a molecule composed of one atom each of N, S, and Cl
calculate the mass loss on heating 1.200 g of a NaHCO3-NaCl mixture containing 65% NaCl
Determine the rate law and the value of k for the reaction at 25oC
the color to change after 2.00 mL of NaOH were added to the flask, calculate the concentration of 2-chloro-2-methylpropane present in solution at t = 106 s.
What is the percent by mass of oxygen in a gaseous mixture whose molar composition is 0.500% CO2 and 99.500% air? The composition of air is 21% mole O2
Assuming it is composed entirely of 206Pb, 207Pb and 208 Pb and the percentages of the two lightest isotopes are equal, calculate the relative percentages of these isotopes in the natural element.
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