A Rigid Insulated Box Contains 20

question 5

Multiple Choice

A rigid insulated box contains 20.0 g of He(g) at 25.0° C and 1.00 atm in one compartment and 20.0 g of N₂(g) at 115° C and 2.00 atm in the other compartment. These compartments are connected by a partition that transmits heat. What is the final temperature in the box at thermal equilibrium? (C_v(He) = 12.5 J/K•mol; C_v(N₂) = 20.7 J/K•mol)

• A) 81.0°C
• B) 70.0°C
• C) 58.9°C
• D) 42.3°C
• E) none of these

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