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Calculate the electron affinity in kJ/mol for X in the hypothetical ionic compound MX from the information given below.
IE1(M) = 432 kJ/mol
M(s) => M(g) ?Ho = 78.6 kJ/mol
?Hof(MX) = -143.9 kJ/mol
X2(g) => 2X(g) ?H = 238 kJ
?Hlattice (MX) = -715 kJ/mol
IE1 (X) = 271 kJ/mol
Calculate the planar densities in ions per square nanometer on the (1 1 1) and (1 1 0) planes for (a) NiO and (b) NaCl. Ionic radii are Ni2+ = 0.078 nm and O2-=0.132nm, Na+=0.098nm, and Cl-=0.181nm
What would you use to prepare a buffer system with a pH of around 4.2. What would you use to make a buffer with a pH of around 9.2? Describe the process you used to choose the correct buffer for each pH.
A sample of neon effuses from a container in 77 seconds. The same amount of an unknown noble gas requires 157 seconds. identify the gas.
The density of an unknown metal is 2.64 and its atomic radius is 0.215 . It has a face-centered cubic lattice.Find the atomic weight of this metal.
1) How many moles of oxygen atoms are present in a sample that contains 3.86 moles of dioxygen difluoride O2F2? The answer I got from this was: 7.72 moles of O2 atoms?
Assuming that prior experiments have shown the single-step extraction removes only 71.0 % of the ethanol, what is the mass of ethanol in your original unknown?
Calculate the pH after 0.15 mol of NaOH is added to 1.00 L of 0.60 M HF and 1.01 M KF.
Calculate the change of entropy for the system when 2.00 moles of a diatomic ideal gas is changed from 25 degrees celsius and 1.5 atm to 135 degrees Celsius
Just based on the orbital occupancy of electrons, is it justifiable to distinguish between the transition and inner transition elements? Should we consider any other factors?
What are the products of reaction of methyl benzoate, benzoic acid, benzaldehyde, and benzophenone with an excess of a Grignard reagent, RMgBr?
solid sodium hydroxide is dissolved in 127.3 g of water at 22.0 C in a perfect calorimeter. Assuming the heat capactity of the solution is the same as water, what is the final temperature of the solution?
negative or about 0. For each, indicate whether the process is always spontaneous, never spontaneous, spontaneous at high temperature or spontaneous at low temperature.
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