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In ionic compounds with certain metals, hydrogen exists as the hydride ion, H-. Determine the electron affinity of hydrogen; that is, Delta H for the process H(g) + e- = H-(g). To do so, the bond energy of H2(g) -812 kJ/mol NaH for the lattice energy of NaH(s) and -57 kJ/mol NaH for the enthalpy of formation of NaH(s)
The numbers indicate the relative amounts present at equilibrium, compared to 1-butene as the standard. 1-Butene: 1.0 cis-2-Butene: 7.2 Trans-2-Butene: 85 Explain this trend qualitively.
The atomic weight of a newly discovered el- ement is 98.225 amu. It has two naturally occuring isotopes. One isotope has a mass of 96.780 amu. The second isotope has a per- cent abundance of 41.7%. What is the mass of the second isotope?
a 0.4196 grams xhx mole fraction of hx solution of an acid hx has a density 1.141 gml and the molar mass of the acid
What is the final concentration of (in M) 15.7 mL potassium hydroxide solution with an initial concentration of 1.553 M which is diluted with 15.6 mL of solvent? Assume the volumes are additive.
Calculate the final temperature when a 22.0 gram sample of ice at 0oC is placed into a styrofoam cup containing 113 grams of water at 77.1 oC. Assume that there is no loss or gain of heat from the surroundings.
Consider the following reaction: NH4HS(s) NH3(g) + H2S(g) An equilibrium mixture of this reaction at a certain temperature was found to have [NH3]=.278M and [H2S]=.355M.
ethyl acetate:petroleum ether was used to elute the chlesterol before dichloromethane
The vapor pressure of water is 439 mm Hg at 358 K, and the enthalpy of vaporization is 40.7 kj/mol.
What is the simplest formula for Chalcocite if a sample of this ore contains 8.274 g copper and 2.088 g sulfur?
For the reaction, calculate how many moles of the product form when 0.048 moles of O2 completely reacts. Assume that there is more than enough of the other reactant. 4Fe + 3O2 ---> 2Fe2O3
7.65.50 mL of 0.161 M HF is titrated with 0.1200 M NaOH. What is the pH after 65.50 mL of base have been added? (Ka for HF is 6.8 x 10-4)
Calculate the percent ionization of 7x10^-3 M butyric acid in a solution that already contains 8x10^-2 m Butanoate. (Ksp for the butanoic acid is 1.5x10^-5
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