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Chapter 19: Q. 15 (page 543)
How much heat is needed to change 20 g of mercury at
into mercury vapor at the boiling point?
The answer is
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In Problems 74 through 76 you are given the equation used to solve a problem. For each of these, you are to
a. Write a realistic problem for which this is the correct equation.
b. Finish the solution of the problem.
74.
51. A concrete table needs to be supported at the four corners by compressed-air cylinders. Each cylinder is in diameter and has a initial length when the pressure inside is . A hoist lowers the table very slowly, compressing the cylinders while allowing them to stay in thermal equilibrium with their surroundings. How much work has been done on the gas of the four cylinders when the table reaches its equilibrium position?
500 J of work are done on a system in a process that decreases the system鈥檚 thermal energy by 200 J. How much heat energy is transferred to or from the system?
A gas is compressed from 600 cm3 to 200 cm3 at a constant pressure of 400 kPa. At the same time, 100 J of heat energy is transferred out of the gas. What is the change in thermal energy of the gas during this process?
A 750 g aluminum pan is removed from the stove and plunged
into a sink filled with 10.0 L of water at 20.0 C. The water temperature
quickly rises to 24.0 C. What was the initial temperature
of the pan in C and in F?
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