Sustainable Energy, SI Edition
2nd Edition
ISBN: 9781337672092
Author: DUNLAP, Richard A.
Publisher: Cengage Learning
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For the solidification of iron, calculate the critical radius r* and the activation
free energy AG* if nucleation is homogeneous. Values for the latent heat of
fusion and surface free energy are -1.85 x 10° J/m³ and 0.204 J/m?,
respectively. Use the supercooling value AT = 291 K, and the melting point of
iron is 1538°C.
Calculate the number of atoms found in a nucleus of critical size. Assume a
lattice parameter of 0.292 nm for solid iron at its melting temperature.
Current Attempt in Progress
What mass of steam at 100°C must be mixed with 344 g of ice at its melting point, in a thermally insulated container, to produce liquid
water at 28.0°C? The specific heat of water is 4186 J/kg-K. The latent heat of fusion is 333 kJ/kg, and the latent heat of vaporization is
2256 kJ/kg.
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For the solidification of iron, calculate the critical radius r* and the activation free energy ΔG* if nucleation is homogeneous. Values for the latent heat of fusion and surface free energy are –1.85 × 109 J/m3 and 0.204 J/m2, respectively. Use the supercooling value ΔT = 291 K, and the melting point of iron is 1538°C.
Calculate the number of atoms found in a nucleus of critical size. Assume a lattice parameter of 0.292 nm for solid iron at its melting temperature.
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Sustainable Energy, SI Edition
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