Question

conversion factors needed: molar masses of O, and Ho, and molar ratio between Ozand Ho. Molar mass Oz: 2 x 16.00 g/mol = 32.00 g/mol Molar mass HO: (2x 1,01 g/mol)*16.00 /mol 7HO-1.5 80xmor 2 mol No1802 1,0 52.00 gomolo 1 .689 = 1.7 HO Now let's try some problems Be sure to give your answers with the correct number of significant figures. 1. Over the years, the thermite reaction has been used for welding railroad rails, in incendiary bombs, and to ignite solid-fuel rocket motors The reaction is: Fe2O3(s) + 2Al(s) - 2Fe (1) +Al:03 (5) a. How many moles of iron (III)oxide must react in order to produce 3.5 mol of Fe7(1.25pts) b. What mass of iron (III)oxide reacted in order to produce 3.5 mol of Fe? (1.25pts) c. If 3.6 g of iron (III) oxide completely reacts, how much Alz0s (in grams) can be produced? (1.25pts) d. If 3.6 g of Al2O3 is produced during the reaction, how many grams of molten iron is produced? (1.25pts)

Answer 1

first identify the no of moles and then calculate the values as follows

are + Al₂O3 1. a) FC2O + QA1 - from the equation Imo Fe₂O3 ? = 354 / - and te 3.5 mol 1.75 moles of Fezon V 2 b) mass of F@20, 5 1.75 nd x 159.69 9lmed -) 29.0575 grans =) 279.4575 grams of F2O3 reacted - c) No. of moles - Mass Molar mass for Fl20g = 3.69 = 0.002254 malige 159.695100 IMO FC2O3 - 1 mol Al2O 0.0022564 moh - ? 0.00225481 a 0.002254 mol A120, Mass = 0.00225m x 101.96 9(mot => 2.2989 1. Auswer =) [2.3 grams to Al₂Og famed d) no. et moles of Al₂O3 = 2.69 0.0353 solo 101.965/7d IMO ALLO - 2Mo Fe 00351 mel - >? = 0.035182 => 0.0706] mer pe Mass et te => 0.0706mdx 55.8455nd 13.9439,