- #1
Monsterboy
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Homework Statement
A perfectly insulated and sealed spherical vessel contains an air-fuel mixture,somehow the mixture is made to burn causing a rise in temperature of the vessel and it's contents.
Homework Equations
Then which of the following is correct?
A) Q=0 ,W=0 ,u=0
B)Q +ve ,W=0 ,u=+ve
C) Q=0 ,W=0 , u +ve
Q-amount of heat input to the system
W-work done by the system
u- change in internal energy.
3. The Attempt at a Solution
I feel the solution is B .As the chemical energy is converted to heat energy ,amount of heat energy is increased within the system. As the increase in heat energy leads to more energy for molecular motion it leads to an increase in internal energy.
The answer that was given to me was C , can we claim that Q=0 is correct ? just because the heat generated due to the ignition of the air-fuel mixture is inside a perfectly insulted and sealed container does that mean there is no increase in heat energy within the system ?
I know that change in total energy inside the system is zero because it is perfectly insulated and sealed, but that does that mean change in heat energy is zero ? ( we know that chemical energy converted to heat energy)