Use the References to access important values if needed for this question. Ignit
ID: 497929 • Letter: U
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Use the References to access important values if needed for this question. Ignition Thermometer Wires Stirrer heat A bomb calorimeter, or a constant volume calorimeter, is a device often used to determine the sample heat of combustion of fuels and the energy content of foods. In an experiment, a 0.5522 g sample of para-benzoquinone (C6H402 is burned completely in a bomb calorimeter. The calorimeter is surrounded by 1.329x103 g of water. During the Water combustion the temperature increases from 22.51 to 24.74 oC. The heat capacity of water is 4.184 J g OC The heat capacity of the calorimeter was determined in a previous experiment to be 946.5 JAoC. Assuming that no energy is lost to the surroundings, calculate the molar heat of combustion of para-benzoquinone based on these data. C6H402(s) 6020 2 H2001) 6 CO20g Energy (g) Insulated Sample Burning Steel sample bomb outside dish Molar Heat of Combustion mo chamber Combustion (bomb) calorimeter.Explanation / Answer
1)
Total heat relased,
Q solution = mw*cw*(Tf-Ti) + Ccal*(Tf-Ti)
= (1.329*10^3)*(4.184)*(24.74 - 22.51) + 946.5*(24.74 - 22.51)
= 1.24*10^4 J + 2.11*10^3 J
= 14510 J
molar mass of C6H4O2 = 6*12 + 4*1 + 2*16 = 108 g/mol
number of mol of C6H4O2 = mass/molar mass
= 0.5522 g / 108 g/mol
= (14510 J) / 5.113*10^-3 mol
= 2838*10^3 J/mol
= 2838 KJ/mol
Answer: 2838 KJ/mol
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