First Law of Thermodynamics: A cylinder contains 1.50 moles of an ideal monatomic gas that is initially at a temperature of 317 K. If the gas gains 2730 J of heat and performs 780 J of work, what is its final temperature? (R = 8.31 J/mol ? K)
A. 359 K
B. 421 K
C. 526 K
D. 687 K
E. 756 K
Answer: B
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