how much energy is released how much energy is released how much energy is relea
ID: 1045611 • Letter: H
Question
how much energy is released how much energy is released how much energy is released Ignition wires heat sample Thermometer Stirrer A bomb calorimeter, or constant volume calorimeter, is a device often used to determine the heat of combustion of fuels and the energy content of foods. Since the "bomb" itself can absorb energy, a separate experiment is needed to determine the heat capacity of the calorimeter. This is known as calibrating the calorimeter. Water In the laboratory a student burns a 0.629-g sample of quinizarin (C14Hg04) in a bomb calorimeter containing 1060. g of water. The temperature increases from 24.30 °C to 27.30 °C. The heat capacity of water is 4.184J gloc1 The molar heat of combustion is -6057 kJ per mole of quinizarin. C14Hg04(8)+ 1402(8) 14 CO2(8)+4 H20)+Energy Calculate the heat capacity of the calorimeter Insulated Sample Burning Steel outside dish chamber sample bomb heat capacity of calorimeter = J/OC Combustion (bomb) calorimeter.Explanation / Answer
heat released(q) = m*s*DT + C*DT
m = mass of water = 1.050*10^3 g
s = specific heat of water = 4.184 j/g.c
DT = 31.26 - 28.3 = 2.96
C = calorimeter constant = 788.5 j/c
q = 1.050*10^3*4.184*2.96+788.5*2.96
= 15.34 kj
no of mol of decanoic acid(n) = 0.4147/172.26 = 0.0024 mol
DHcombustion = -q/n
= - 15.34/0.0024
= -6391.7 kj/mol
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