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Look up the standard enthalpies of formation of glucose and

Look up the standard enthalpies of formation of glucose and ethanol (Table 9.8), and verify that eq.

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Look up the standard enthalpies of formation of glucose and ethanol (Table 9.8), and verify that eq. (26.4)

is exothermic. Then verify that the gravimetric energy density (relative to combustion) of ethanol is approximately twice that of glucose.

Table 9.8

Transcribed Image Text:

СоН1206 > 2C2Н;ОН + 2СО2 Compound Chemical дн АG/ formula (kJ/mol) (kJ/mol) Diatomic gases H2, 02, C12,... Methane CH4(g) -75 -51 Water vapor H2O(g) -242 -229 Water liquid H2O(1) -286 -237 Octane (1) 8H18(0) -250 +6 Ethanol (g) C2H50H(g) -235 -168 Ethanol (1) cHsонФ) -278 -175 Carbon dioxide (g) CO2(g) -394 -394 Carbon monoxide (g) CO -111 -137 Calcium oxide Cao -635 -604 Iron ore (hematite) Fe2O3 -824 -742 Calcium carbonate CaCO3 -1207 -1129 Glucose C6H1206 -1268 -910 Ammonia NH3 -46 -16.4

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Taking H f from the table Hr 2278 2394 1268 76 kJmol The standard ...View the full answer

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The Physics of Energy

ISBN: 978-1107016651

1st edition

Authors: Robert L. Jaffe, Washington Taylor

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Question Posted: Jan 22, 2019 05:10 AM

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