Question

Question 7 1 pts The thermite reaction, used for welding iron, is the reaction of Fe3O4 with Al. 8 Al(s) + 3 Fe3O4 (s) —+ 4 A1203 (s) + 9 Fe (s) AH° = -3350. kJ/mol rxn Because this large amount of heat cannot be rapidly dissipated to the surroundings, the reacting mass may reach temperatures near 3000. °C. How much heat (in kJ) is released by the reaction of 17.2 g of Al with 70.5 g of Fe3O4? Enter a positive number since released already tells us it is a negative number (to 1 decimal place). (MTS 2/10/2018)

Answer 1

3 ср (5) + 3FC on ts) 24. 90, о cs +2 Fe(s) are's3562 moh aog AR : 17 28 dar mass of Alexminium: 26.981539 duit no s leg 00 1725 26 3 = 0. 63 747 Naog - Fe, е 50 redue massa fou = 231.5 33 use по идея •40 20- 50 гр. 3o49 ust 931 5332) 9 & Ae" — за го 0.62 р ) ш. 4 80 — ft xo 63747 «? по - ker Peo co 93 705 и criven no z moe, thou= 0.30449 moh. so gou in cucer reactant Al' in limiting realand sudes of Al 3350 kJ of heat in Delen p. 63 74, 7 и 2 ot —) 350 xо: 4 х 74 2.7 zuik t redead Anment of heat Released = 266.94 kJ = 266.9 knih - 2 haut