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Calculate the change in internal energy for a system that absorbs 242 J of heat and does 193 J of work on the surroundings...

  • chemistry - ,

    internal energy, U, is the sum heat, Q, and work, W:
    U = Q + W
    U = 242 - 193
    U = + 49 J

    >>>sign conventions for U = Q + W:
    *heat absorbed by the system is (+)
    *heat released by the system is (-)
    *work done BY the system is (-)
    *work done ON the system is (+)
    *work done BY the surroundings is (+)
    *work done ON the surroundings is (-)

    but note that in some books the formula for internal energy is U = Q - W

    so there,, :)

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