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91. Top fuel dragsters and funny cars burn nitromethane as fuel according to the balanced combustion equation: 2 CH3NO2(1) + 3 202(g) — 2 CO2(g) + 3 H20(1) + N2(8) AHx= -1418 kJ The enthalpy of combustion for nitromethane is -709.2 kJ/mol Calculate the standard enthalpy of formation (AH) for nitro methane.

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Please show work and all parts. Thanks!

A bomb calorimeter was calibrated by burning 1.031 g of benzoic acid (C6H5COOH, M = 122.13g/mol) in excess oxygen. The temperature inside the calorimeter rose from 23.2Â°C to 36.7Â°C.

a. What is the heat capacity of the bomb calorimeter, in units of kJ/Â°C? ÎrU = -3230 kJ/(1 mol benzoic acid)

b. Nitromethane, (CH3NO2 M = 61.04 g/mol), commonly known as ânitroâ, is the fuel used in racing cars. Write the formation reaction for liquid nitromethane.

c. A sample of nitromethane was burned in the bomb calorimeter calibrated above. The following energy value was determined for the balanced reaction:

4CH3NO2(l) + 3 O2(g) â 4 CO2(g) + 6 H2O(l) + 2 N2(g) ÎrU= -3740 kJ/mol

Calculate ÎHf for nitromethane, in units of kJ/mol.

â¢ Assume that ÎrH= ÎrU within the accuracy of this experiment.

â¢ÎfHÂ°(gaseous CO2) = - 393.52 kJ/mol ÎfHÂ°(liquid H2O) = - 285.83 kJ/mol.

d. It is assumed above that ÎrH= ÎrU for the combustion of nitromethane.

â¢ Estimate how much work is done, in units of kJ/mol, for the combustion reaction as written in part c at 298 K.

â¢Is work done by the system, the surroundings, or neither?

â¢Justify whether the assumption is a valid one.

Ok, so this problem has no examples or anything, and nothingtalksabout it in the previous chapters. Could anyone help me? Ihavetried doing it on my own and looking back on work but I can'tseemto figure it out.

This is the problem: Remote controlled model boats arepoweredby burning methanol or a racing mixture of 80% methanol and20%nitromethane by mass. Te standard enthalpies of formation ofliquidmethanol and nitromethane are, respectively, -283.6 kJ/moland-74.78 kJ/mol. a) Draw structural diagrams for all reactantsandproducts. b) Calculate the percentage change in energyoutputachieved by using a racing mixture. Our teacher gave us thisaswell: CH3NO2 + O2 --> CO2 + 3/2 H2O + NO So I'm guessingthatwould be the equation for nitromethane...but if I have to doaformation equation shouldn't it be only 1 equation? And so Ineedto make a second one for the combustion of methanol? If Icanunderstand that, I'm sure I can do the rest no problem, but thisiswhere I am stuck.