If Delta Q and Delta W represent the heat sup | vedclass

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(B) The first law of thermodynamics is generally expressed as $\Delta Q = \Delta U + W_{by}$,where $W_{by}$ is the work done $BY$ the system.In this p

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$\Delta Q = \Delta U - \Delta W$

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(B) The first law of thermodynamics is generally expressed as $\Delta Q = \Delta U + W_{by}$,where $W_{by}$ is the work done $BY$ the system.In this problem,$\Delta W$ is defined as the work done $ON$ the system.By sign convention,work done on the system is negative of work done by the system,so $W_{by} = -\Delta W$.Substituting this into the first law equation: $\Delta Q = \Delta U + (-\Delta W)$.Therefore,the correct expression is $\Delta Q = \Delta U - \Delta W$.

If $\Delta Q$ and $\Delta W$ represent the heat supplied to the system and the work done on the system respectively,then the first law of thermodynamics can be written as,where $\Delta U$ is the change in internal energy.

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