Question

8. Find the standard enthalpy of the following reaction: 2Al(s)+ Fe,O(s)ALO(s)+2Fe(s) Use enthalpies of reactants and products from the textbook. Determine the energy of an electromagnetic radiation of 550 nm wavelength. 9. 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 1010m.

Answer 1

8. Aug feaOg = -822 kJ/mol AHq Al Oz = - 1669 kJ/mol Fez O2 (s) + 2Al(s) — Als Os (8) + are(s) AHORx = {(Ah - DHA) we know, OH Clement = 0 AH&x = (-1669 + 2 (0))-(-822 + 2(0)) AHRX = - 847 kJ / moel