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Heat capacity and work done by various systems

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Questions:
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 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

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 ...

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