A container is placed in a water bath held at constant Volumeas a mixture of fue

Question

A container is placed in a water bath held at constant Volumeas a mixture of fuel and oxygen is burnedinside it. The temperatureof the water is observed to rise during (the water also contantvolume). a)consider the burning mixture to be the system. What aresigns of Q, u, and W? b)the water was the system. whats the signs of Q,U,W? A container is placed in a water bath held at constant Volumeas a mixture of fuel and oxygen is burnedinside it. The temperatureof the water is observed to rise during (the water also contantvolume). a)consider the burning mixture to be the system. What aresigns of Q, u, and W? b)the water was the system. whats the signs of Q,U,W?

Explanation / Answer

(a) . Heat is released from the system So, Q = -ve        System is at constantvolume So, work done W = 0        So, change in internalenergy U = -ve     Since from frstlaw of thermodynamics (b). For water ,       Heat is taken from mixture So,Q = + ve       work done W = 0 Since it is also at constant volume      So, change in internal energy U = +ve     Since from frst law ofthermodynamics

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