Two Solutions (The System), Each with a Volume of 25

question 21

Multiple Choice

Two solutions (the system) , each with a volume of 25.0 mL at 25.0°C, are mixed in a beaker. A reaction occurs between them, and the temperature rises to 35.0°C. After the products have equilibrated with the surroundings, the temperature is again 25.0°C and the total volume is 50.0 mL. No gases are involved in the reaction. Which relationship concerning the change from initial to final states (both at 25.0°C) is correct?

• A) ΔU = 0
• B) ΔH = 0
• C) ΔU > 0
• D) q = 0
• E) w = 0

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