# chemistry

A 0.500 g sample of TNT (C7H5N2O6) is burned in a bomb calorimeter containing 610 grams of water at an initial
temperature of 20.00ºC. The heat capacity of the calorimeter is 420 J/ºC and the heat of combustion of TNT is 3374
kJ/mol. Using these data, calculate the final temperature of the water and calorimeter once the reaction is complete

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1. molar mass TNT = about 213 but you need to confirm all of these estimates and recalculate each and every one.
delta T = Tfinal-Tinitial = Tf - 20.
heat combustion = 3374 kJ/213 g so 0.500 will give
3374 x (0.500/213) = 7.9 kJ
7,900 J = 610 g x 4.184 J/g*C x (Tfinal - 20) + 420 J/C(Tfinal-20)
Solve for Tfinal. Post your work if you stuck.

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DrBob222

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