ThermochemistryHard
Question
The standard molar enthalpies of formation of trinitrotoluene(l), CO2(g) and H2O(l) are 65, −395 and −285 kJ/mol, respectively. The density of trinitrotoluene is 1.816 g/ml. Trinitrotoluene can be used as rocket fuel, with the gases resulting from its combustion streaming out of the rocket to give the required thrust. What is the enthalpy density for the combustion reaction of trinitrotoluene?
Options
A.−28.34 MJ/L
B.−28.34 kJ/L
C.−27.30 MJ/L
D.−8.59 MJ/L
Solution
$(l) + \frac{21}{4}O_{2}(g) \rightarrow 7CO_{2}(g) + \frac{5}{2}H_{2}O(l) + \frac{3}{2}N_{2}(g) $$${\Delta H = 7 \times ( - 395) + \frac{5}{2} \times ( - 285) - (65) }{ = - 3542.5\text{ kJ/mol} }{ = - \frac{3542.5}{227} \times 1.816\text{ kJ/mol} }{ = - 28.34\text{ kJ/mol} = - 28.34\text{ MJ/L}}$$
Create a free account to view solution
View Solution FreeMore Thermochemistry Questions
Enthalpies of solution of BaCl2(s) and BaCl2·2H2O(s) are −20.6 kJ/mol and 8.8 kJ/mol, respectively. ΔH hydration of BaCl...Based on the following thermochemical equations,H2O(g) + C(s) → CO(g) + H2(g): ΔH = 131 kJCO(g) + ½ O2(g) → CO2(g): ΔH =...A solution was prepared by dissolving 7.45 g of KCl in 200 g of H2O in a calorimeter with a water equivalent of 25 g. Th...The intermediate SiH2 is formed in the thermal decomposition of silicon hydrides. Calculate ΔHf° of SiH2 from the follow...Reaction involving gold have been of particular intersect to alchemists. Consider the following reactions, Au(OH)3 + 4 H...