Trinitrotoluene or TNT (MWT = 227 g/mol), will decompose explosively by the foll

Question

Trinitrotoluene or TNT (MWT = 227 g/mol), will decompose explosively by the following chemical reaction. This reaction produces a large amount of hot gases that will rapidly expand. 2C_7H_5N_3O_6(s) rightarrow 3N_2(g) + 5H_2O_(g) + 7CO(g) + 7C(s) To set-up the reaction, a demolitions expert puts 4.161 g of TNT into a 1 L container that contains air at STP. What is the initial pressure (in mm Hg) of the air in the container before the TNT is detonated? The reaction is started and all of the TNT is rapidly consumed. How many moles of each gas will be produced in the chemical reaction? moles N_2 moles H_2O moles CO

Explanation / Answer

a) Iitial Pressure is 1 atm = 760 mm Hg

b) TNT moles = mass / molar mass of TNT = 4.161 /227 = 0.01833

2 moles TNT gives 3 moles N2

hence N2 moles = ( 3/2) TNT moles = ( 3/2) x 0.01833 = 0.0275

2 TNT gives 5H2O

moles of H2O = ( 5/2) TNT moles = ( 5/2) x 0.01833 = 0.045825

2 TNT gives 7 CO

CO moles therfore = ( 7/2) TNT moles = ( 7/2) x 0.01833 = 0.06416

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