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    Bomb Calorimeter, gross heat of combustion

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    In the following experiment 1.1651g of benzoic acid (6318 cal/gm) produced a net corrected temperature rise of 3.047C, also 8 cm (2.3 cal/cm) of fuse wire were consumed in the firing. How does one go about to compute the gross heat of combustion, in cal/gram. Then using this standardization how does one find the gross heat of combustion of this following unknown, in which 1.354g and 7 cm of fuse wire, with a temperature rise of 2.987C were consumed in the firing.

    © BrainMass Inc. brainmass.com December 24, 2021, 8:34 pm ad1c9bdddf
    https://brainmass.com/chemistry/physical-chemistry/bomb-calorimeter-gross-heat-combustion-289481

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    In the following experiment 1.1651g of benzoic acid (6318 cal/gm) produced a net corrected temperature rise of 3.047C, also 8 cm (2.3 cal/cm) of fuse wire were consumed in the firing. How does one go about to compute the gross heat of combustion, in cal/gram. Then using this standardization how does one find the gross heat of combustion of this following unknown, in which 1.354g and 7 cm of fuse wire, with a temperature rise of 2.987C were consumed in the firing.

    Solution:
    With benzoic acid:
    Total heat released = heat released by benzoic acid + heat released by wire
    = 1.1651 g × 6318 cal/g + 8 cm × 2.3 cal/cm
    = 7379.5018 cal

    Heat capacity of the bomb = 7379.5018 cal ÷ 3.047 oC
    = 2421.89 cal/oC

    With the unknown:
    Total heat released by the unknown and the wire = 2421.89 cal/oC × 2.987 oC
    = 7234.188 cal

    Heat released by the unknown = total heat released - heat released by the wire
    = 7234.188 cal - 7 cm × 2.3 cal/cm
    = 7218.088 cal

    Gross heat of combustion of unknown
    = 7218.088 cal ÷ 1.354 g
    = 5330.94 cal/g

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    © BrainMass Inc. brainmass.com December 24, 2021, 8:34 pm ad1c9bdddf>
    https://brainmass.com/chemistry/physical-chemistry/bomb-calorimeter-gross-heat-combustion-289481

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