Question

Any help with any of the problems, is appreciated!

Enthalpy Exercises 1. (20 pts) The Seattle fire department fought several violent fires in 1991 whose temperatures were so high that they melted steel and crumbled concrete. In all likelihood, the arsonists were using a mixture of aluminum dust and ammonium nitrate, which produces aluminum oxide, water vapor, and nitrogen gas. Calculate the amount of heat evolved by the reaction of one pound each of ammonium nitrate and aluminum dust. 2. (15 pts) Simple thermal decomposition of ammonium nitrate yields gaseous water vapor and nitrous oxide (dinitrogen monoxide). About 2,500 tons of fertilizer grade' ammonium nitrate were in the holds of the ship 'Grandcamp' on April 16, 1947 in Texas City. A small fire began in hold No. 4. The crew could not extinguish it, and 37 minutes later the ship was vaporized in a violent explosion. The nearby Monsanto chemical complex was devastated. A second ship, the 'High Flyer', also was loading ammonium nitrate, and it too exploded. Over 500 people died, and two- thirds of the buildings of Texas City were destroyed. Calculate the amount of heat evolved by the decomposition of 2,500 tons of ammonium nitrate. (1 ton = 1000 kg) 3. (20 pts) In 1990, a worker at the Arthur C. Little Co. was killed in a violent explosion when a sludge of titanium metal flake and silver(I) nitrate suddenly exploded to yield titanium(II) oxide, silver metal and nitrogen gas. Calculate the amount of heat evolved by the reaction of one pound each of titanium and silver nitrate.

Answer 1

. The reaction is 2 Alls) + 3 NHY NO Log) Al2O3 + 6H2O + 3 H2 (9) (9) Atran = 2x Hy Algu) + 6x QHj (H2018) + 3x4 H3 (N2(9)) - 2x HI (Alu) - 3x & HJ LN Hy NO₂ (98) - 2x1-1669.8) + 6*(-241-82) + 3x0 - 2x0 - - 3 x t-3 65.6) = - 3693.7 kJ a. Now, he notes of N My NO₂ = 1 lb inolar mass = 453.592 g 30.043 g/mol - 5.667 mol moles of Al = 453.592 mol = 16.81 mol 26.982 Clearly NHU Noz is the limiting reagent. . Energy released a - Arth 3693.7 A moles of NHU NO 5.66 - Ato xnx moles of Nity NO₂ = 23693-7x 5.667 boles 20932.2 kJ

Comment if any problem

Please post each question separately and each one will be solved for sure.