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    Delta E

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    a) Identify the following systems as open, closed, or isolated.

    i) Coolant in a refrigerator coil
    ii) The combustion of liquid hexane in a bomb calorimeter

    b) A gas sample heated in a cylinder uses 650 kJ of heat. A piston that compresses this gas does 800 kJ of work. what is the change in internal energy, delta E, of the gas during this process?

    © BrainMass Inc. brainmass.com December 24, 2021, 11:01 pm ad1c9bdddf
    https://brainmass.com/chemistry/physical-chemistry/change-internal-energy-example-problem-527528

    SOLUTION This solution is FREE courtesy of BrainMass!

    A coolant in a refrigerator coil is a closed system as it exchanges heat with the surrounding but not matter. On the other hand, a bomb calorimeter is an isolated system if it is indeed perfectly insulated. Isolated systems exchange neither heat nor matter with the surroundings.

    dE = q+w

    Here because the gas absorbs heat , q = +650 kJ

    Work is done on the gas, hence w = + 800 kJ

    Hence dE for the gas = 650 + 800 = 1450 kJ

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

    © BrainMass Inc. brainmass.com December 24, 2021, 11:01 pm ad1c9bdddf>
    https://brainmass.com/chemistry/physical-chemistry/change-internal-energy-example-problem-527528

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