Question

8. Find the standard enthalpy of the following reaction: 2Al(s) + Fe,O,() + ALO,(s) + 2Fe(s) Use enthalpies of reactants and products from the textbook. DH Fego, = -822 kJ/mol DHO ALO, -1669xJlnol Fe 2 O (s) + 2 Ales) Al₂O3(s) + 2 tel.) DHRY 4 Colup -suor) Dolpx=(-1668 +260))-(-822 +2:00) (OH R X=-847 k5l nol) 9. Determine the energy of an electromagnetic radiation of 550 nm wavelength. 10. What is the velocity of an electron having a de Broglie wavelength that is approximately the length of a chemical bond? Assume this length to be 1.2 x 10 m.

Answer 1

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A1203 181 + fels) 8. 2Al(s) + fe,03 (9) - standard enthalpies : DHE [Al(s)] = OKT Imol DHA ( Fe20-3\s/) -824,2 KIImo/ DHE [ Ale U5 (5)] = -1675: 7 KJ/mol SHOP [Fels) ] = O KIlmol standard enthalpy of reaction = A Hixo Horn - AHOXN - Eshi ( Products) - DHA (Reactants) AHCA1, 0318)] +3X A HY [fe(s)] - 2 x 4HY [Al(s)] - OH [fesog 13)] Atren = won [-1615.7 + 200 - 2x0 - 1-824,2)] kJ molt THRD – 851.5 KJ/mol Answer.