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

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

Correct Answer:

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