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Q: A reaction has the following thermochemical values at 272.15 K: ΔH = -189.3 kJ mol-1 ΔS = -166.0 J…
A: Given-> Temperature (T) = 272.15 K ∆H = -189.3 kJ.mole-1 = -189300 J.mole-1(1KJ=1000J) ∆S =…
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- estimate the fraction of electrons above fermi level in sodium and copper at room temperatureDifferentiate AAS, AAS-Graphite, FES and ICP-MSWhen a metal is heated its density decreases. There are two sources that give rise tothis diminishment of : (1) the thermal expansion of the solid, and (2) the formation of vacancies. Consider a specimen of gold at room temperature that has a density of 19.320 g/cm3.(a) Determine its density upon heating to (800°C) when only thermal expansion is considered.(b) Repeat the calculation when the introduction of vacancies is taken into account. Assume that the energy of vacancy formation is 0.98 eV/atom, and that the volumecoefficient of thermal expansion, is equal to 3 αl
- Write the electronic configuration of 3 Li and 26Fe and explain the possible valency they can exhibit.Which process in the diagram below shows phosphorescence? A. 1 B. 3 C. 5 D. 4Discuss the nature of bonds in NaCl and diamond. What do you mean by directionality of covalent bonds? Why materials with covalent bonds are brittle?
- Calculate the energy (in eV/atom) for vacancy formation in some metal, M, given that the equilibrium number of vacancies at 343oC is 9.39 × 1023 m-3. The density and atomic weight (at 343°C) for this metal are 7.75 g/cm3 and 142.6 g/mol, respectively.Molybdenum has a BCC crystal structure, an atomic radius of 0.1363 nm, and an atomic weight of 95.94 g/mol. Compute for its density.is mesosphere solid or liquid?
- LiH crystallizes with the same structure as NaCl. Given the ionic radii and the molar mass of Li+ ( 0..90A, 6.94 g/mole) and H- (1.34A, 1.01 g/mole), estimate the density of LiH in g/cm3.melting and boiling points of d-block elements are very high. explain, also variation in M.P and B.P as we move in a particular series of d-block elements.if the ratio of the radius of a cation to the radius of an anion is 0.380, we expect ______coordination