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For path ABC, Heat given to the system is 60 J and work done by the system is 30 J

For path ABC, Heat given to the system is 60 J and work done by the system is 30 J.

For path ADC, work done by the system is 10J. The heat given to the system for path ADC is

(1) 100 J (2) 80 J (3) 40 J  (4) 60 J

Answers (1)
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For ABC

\Delta Q_{ABC} = \Delta W_{ABC} + \Delta U_{ABC}

60 J = 30 J + \Delta U_{ABC}

\Rightarrow \Delta U_{ABC} = 30 J

\Delta U_{ADC} = \Delta U_{ABC} = 30 J

For ADC

\Delta Q_{ADC} = \Delta U_{ABC} +\Delta W_{ADC}

= 30 + 10 = 40 J

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