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Consider the following data. 2 Ca(s) + O2(g) 2 CaO(s) H = -1270.2 kJ C(s) + O2(g) CO2(g) H = -393.5 kJ CaO(s) + CO2(g) CaCO3(s) H = -178.3 kJ Use Hess's law to calculate H for the reaction below. 2 CaCO3(s) 2 C(s) + 2 Ca(s) + 3 O2(g) H = kJ
Combustion of a 0.1000 g sample of a compound containing only carbon, hydrogen, and oxygen in excess yields 0.1953 g CO2, and 0.1000 g H2O. A separate experiment shows that the molar mass is 90 Daltons. Calculate the mass percent composition.
A catalyst has a avoid fraction of 0.40, an internal surface area of 180 m2/g and a pellet density of 1.40 g/cm3. Estimate the effective diffusivity of thiophene with hydrogen
The pKb values for the dibasic base B are pKb1 = 2.1 and pKb2 = 7.6. Calculate the pH at each of the following points in the titration of 50.0 mL of a 0.95 M B(aq) with 0.95 M HCl(aq).
0.1 M NaCl was slowly added would a precipitate(s) form? if more then one precipitate could form, predict the order of appearance of the precipitates.
The average mass of a carbon atom is 12.011. Assuming you were able to pick up only one carbon atom, the chances that you would choose a carbon atom with a mass of 12.011 is:
The wavelength corresponding to threshold frequency to tungsten surface is 230nm . Calculate the kinetic energy of the photoelectron ejected from the surface of tungsten metal.
Determine what is the longest possible wavelength of light that could ionize an atom of bismuth if the first ionization energy of bismuth is Ei1 = +70 kJ/mol.?
The chiral carboxylic acid A (C5H6O2) reacts with 1 mol of hydrogen gas on catalytic hydrogenation. The product is an achiral carboxylic acid B (C5H8O2). What are the structures of Compounds A and B?
Calculate Q when the solutions are mixed (time zero). Indicate how the reagent concentrations will changes as the reaction proceeds.
Calculate the concentration of all species in a 0.050 M tartaric acid solution. These species include [H3O+], [HC4H4O6^1-], H2C4H4O6] and [C4H4O6^2-]. For tartaric acid, Kal=1.0 x 10^-3 and Ka2=4.6 X 10^-5.
Write the electron configuration in spectroscopic notation starting with the preceding inert (please also explain a lil bit if you have time) gas for the following. Tell whether each is paramagnetic or diamagnetic.
After the reaction was completed. The solution was back titrated with a NaOH solution (33.50 mL of 0.1500 M).Calculated the Molecular Mass of MCO3. Determine what is this sample: CaCO3 ; MgCO3; or BaCO3 ?
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