y=40 8) The work done to compress a gas is 74 J. As a result, 26 J of heat is given off to thesurroundings. Calculate the change in energy of the gas.9) Determine the amount of heat (in kJ) given off when Y x 104 g of NO2 are producedaccording to the equation:2NO(g) + O2(g) → 2NO2(g)AH = -114.6 kJ10) A sheet of gold weighing Y g and at a temperature of 18.0°C is placed flat on a sheet ofiron weighing 20.0 g and at a temperature of 55.6°C. What is the final temperature of thecombined metals? Assume that no heat is lost to the surroundings.

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The work done to compress a gas is 74 J. As a result, 26 J of heat is given off to the surroundings. Calculate the change in energy of the gas.

Chemistry: An Atoms First Approach

2nd Edition

ISBN:9781305079243

Author:Steven S. Zumdahl, Susan A. Zumdahl

Publisher:Steven S. Zumdahl, Susan A. Zumdahl

Chapter7: Chemical Energy

Section: Chapter Questions

Problem 109AE: A sample of nickel is heated to 99.8C and placed in a coffee-cup calorimeter containing 150.0 g...

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Question

y=40

8) The work done to compress a gas is 74 J. As a result, 26 J of heat is given off to the
surroundings. Calculate the change in energy of the gas.
9) Determine the amount of heat (in kJ) given off when Y x 104 g of NO2 are produced
according to the equation:
2NO(g) + O2(g) → 2NO2(g)
AH = -114.6 kJ
10) A sheet of gold weighing Y g and at a temperature of 18.0°C is placed flat on a sheet of
iron weighing 20.0 g and at a temperature of 55.6°C. What is the final temperature of the
combined metals? Assume that no heat is lost to the surroundings.

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