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Problem- The enthalpy of formation of methanethiol, CH3SH(g), is ?22.9 kJ/mol. Methanethiol can be synthesized by the reaction of gaseous methanol and H2S(g). Water vapor is another product. Use this information and data from elsewhere in the text to estimate the carbon-to-sulfur bond energy in methanethiol.
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Draw a Lewis structure for each of the following molecules, and then use the VSEPR theory to predict the molecular deometry of each.
a weather balloon has a volume of 750 l when filled with helium at 8 oc at a pressure of 380 torr. what is the new
Calculate the percent population of the first 10 rotational energy levels for HBr (rotational constant B = 8.46cm^-1) at 298K?
How many grams of NH4Cl must be added to 424 mL of a 0.69 M solution of NH3 to prepare a pH = 9.00 buffer.
Consider a particle with quantum number n moving in a one-dimensional box of length l. Determine the probability of finding the particle in the left quarter of the box.
what is the ph of a solution prepared by mixing 50.00 ml of 0.10 m methylamine ch3nh2 with 20.00 ml of 0.10 m
C and dropped into a calorimeter containing water (specific heat capacity 4.18 J/ g C) initially at 20.2deg C. The final temperature of the water is 33.7 deg C. Caluclate the mass of water in the calorimeter.
An aqueous CaCl2 solution has a vapor pressure of 83.0 mmHg at 50 degrees celsius . The vapor pressure of pure water at this temperature is 92.6 mmHg.
The heat of fusion of acetic acid is 11.5 kJ/mol. Its melting point is 16.6 C. The change in entropy for the melting of acetic acid in J(mol * K) is
If 37.0 mL lead(II) nitrate solution reacts completely with excess sodium iodide solution to yield 0.700 g precipitate, what is the molarity of lead(II) ion in the original solution?
0.05 mL sample of 0.436 M NH4NO3 is diluted with water to a total volume of 250.0 mL. What is the ammonium nitrate concentration in the resulting solution?
describe the importane of chemical elements to living
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