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    Heat capacity and work done by various systems

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    a. Calculate the heat capacity of a radiator coolant if a temperature rises from 5 to 107 °C requires 932 J of heat.
    b. What is the change in internal energy for a system that does 7.02 kJ of work and absorbs 888 J of heat?

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    Solution Preview

    Both questions deal with chemical energetic. It is important to know the sign convention since this is a common
    mistake that students make in problems dealing with chemical energetic.
    a. The common formulas to deal with such problems are
    q = ms?t = c?t, where q is the heat gained or lost, s is the specific heat capacity, c is the heat capacity and ? t the
    change in temperature.
    In this problem, the temperature of the radiator rises, meaning heat q is positive, thus
    q = + 932 ...

    Solution Summary

    The heat capacity and the work done is calculated step-by-step for systems in different conditions. The sign convention is discussed and clarify in misconception