As 7 10 Pts Fuel Cells Provide Electrical Power For Spacecraft And Show Promise Power Sources For Automobiles Hydrog 1 (97.7 KiB) Viewed 99 times
as 7. (10 pts) Fuel cells provide electrical power for spacecraft and show promise power sources for automobiles. Hydrogen and carbon monoxide have been investigated for use in fuel cells, so their solubilities in molten salts are of interest. Their solubilities in a molten NaNO3/KNO3 mixture were found to fit the following expressions: 768 -5.39 – Τ/Κ 980 log sco = -5.98 – – T/K where s is the solubility in mol cm-3 bar. Calculate the standard molar enthalpies of solution of the two gases at 570 K. log SH2 = = S
8. (10 pts) The Helmholtz free energy (A) of a polymer chain follows the relation with the polymer size Ras follows. A R2 αυ: + kBT R3 N62 N2 kb and T are the Boltzmann constant and temperature, respectively. b and v are a monomer size and the excluded volume, respectively, which are constants for a given polymer. N is the number of monomers of the polymer. Prove that at equilibrium the polymer size R scales with the number (N) of monomers of a polymer chain as R - N0.6.
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