Q1a: What is the change in internal energy of a system (ΔU) if 5.42 kl of heat is absorbed by the system and 3425 J of work is done on the system (by the surroundings) for a certain process? Expess your answer in kJ 1b: A sample of oxygen gas (O₂) effuses into a vacuum 1.8 times faster than an unknown gas. What is the molecular weight of this unknown
Q1a: What is the change in internal energy of a system (ΔU) if 5.42 kl of heat is absorbed by the system and 3425 J of work is done on the system (by the surroundings) for a certain process? Expess your answer in kJ 1b: A sample of oxygen gas (O₂) effuses into a vacuum 1.8 times faster than an unknown gas. What is the molecular weight of this unknown
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question
Q1a: What is the change in internal energy of a system (ΔU) if 5.42 kl of heat is absorbed by the system and 3425 J of work is done on the system (by the surroundings) for a certain process?
Expess your answer in kJ
1b: A sample of oxygen gas (O₂) effuses into a vacuum 1.8 times faster than an unknown gas. What is the molecular weight of this unknown gas (in g mol^-1)? Do not try to identify the gas.
Expert Solution
Step 1
A. From the first law of thermodynamics:
Q + W = ∆U ...(1)
Here, Q = +5.42 kJ (as heat absorbed by the system) and W = 3425 J = +3.425 kJ (as work is done on system)
Putting these values into equation 1 we have :
∆U = 5.42+3.425 = 8.845 kJ
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