The mechanical properties of a metal may be improved by incorporating fine particles of its oxide. Given that the moduli of elasticity ofthe metal and oxide are, respectively, 50 GPa and 380 GPa, what is the (a) upper-bound, and (b) lower-bound modulus of elasticityvalues (in GPa) for a composite that has a composition of 0.59 vol% of oxide particles.(a)GPa(b)iGPa

Given data:Emetal=50GPa moduli of elasticity of the metalEoxide=380GPa moduli of elasticity of the…

Answered: The mechanical properties of a metal…

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter16: Thermodynamics: Directionality Of Chemical Reactions

Section: Chapter Questions

Problem 121QRT

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The enthalpy of combustion of buckminsterfullerene, C60, is -26,367kJ/mol. C60(s)+60O2(g)60CO2(g) Determine the fHofC60..
The enthalpy of sublimation of calcium at 25 °c is 178.2 kJ mol- 1.How much energy (at constant temperature and pressure) must be supplied as heat to 5.0 g of solid calcium to produce a plasma (a gas of charged particles) composed of Ca2+ ions and electrons?
When 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
3.) Calculate the vacancy fraction for lead at its melting temperature of 3270 degrees celsius. You may assume that the vacancy formation energy is 0.55eV.
the ionic compound L2O3(s) is the ionic compound formed from oxygen and a metal with the form L(s) at 1.00 bar and 298 K. (a) Draw the Lewis structure for L2O3. Assume that all the valence electrons from L are required. (b) Use the following information to determine the enthalpy of formation for L2O3(s). Express your answer in kJZ(mol L2O3(s)). Lattice energy for L2O3(s) = -14836 kJ mol1 AHsub for L(s) = 358 kJ mol 1 First ionization energy for L(g) = 577 kJ mol 1 Second ionization energy for L(g) = 1794 kJ mol 1 Third ionization energy for L(g) = 3820 kJ mol 1 Bond dissociation energy for O2(g) = 498 kJ mol 1 %3D First electron affinity for O = -141 kJ mol 1 Second electron affinity for O = 744 kJ mol 1
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3. One mole of liquid water at 100 °C is heated until the liquid is converted entirely to vapor at 100 °C and 1 atm pressure. Calculate q, w, AE and AH for each of the following. (a) The vaporization is carried out in a cylinder where the external pressure on the piston is maintained at 1 atm throughout. (b) The cylinder is first expanded against vacuum (Pext = 0) to the same volume as in part (a), and then sufficient heat is added to vaporize the liquid completely to 1 atm pressure.
Given the following data: CO(g)+H20(g)→ CO,(g)+ H2(g) AH° (25°C) = -42.0 kJmol1 C, (CO) = 26.8 + 6 x 10³T JK'mol1 C, (H2O) = 30.1+ 10 x 10³T JK'mol1 Cp (H2) = 28.5 + 2 x 10³T JK'mol1 C, (CO2) = 26.4 + 42 x 10³T JK-'mol1 where T is the thermodynamic temperature, calculate the change in enthalpy for the reaction at 1000 K.
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The N2O molecule has the structure N-N-O. In anordered crystal of N2O, the molecules are lined up in aregular fashion, with the orientation of each determinedby its position in the crystal. In a random crystal (formedon rapid freezing), each molecule has two equally likelyorientations.(a) Calculate the number of microstates available to a random crystal of NA (Avogadro’s number) of molecules.(b) Calculate the entropy change when 1.00 mol of a random crystal is converted to an ordered crystal.

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