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  • The diagram of a system undergoing thermodynamic transformation as shown in figure. The work done

The \mathrm{p-V}diagram of a system undergoing thermodynamic transformation as shown in figure. The work done by the system in going from \mathrm{a \rightarrow b \rightarrow c} is \mathrm{50 \mathrm{~J}} and \mathrm{20 \mathrm{cal}} heat is given to the system. The change in internal energy between \mathrm{a} and \mathrm{c} is

Option: 1

34 \mathrm{~J}


Option: 2

70 \mathrm{~J}


Option: 3

84 \mathrm{~J}


Option: 4

134 \mathrm{~J}


Answers (1)

best_answer

Heat added to system is given by

\mathrm{\Delta Q=\Delta U+\Delta W}

\mathrm{\text { Here, } \quad \Delta Q=20 \mathrm{cal}=84 \mathrm{~J}}

\mathrm{ \text { and } \quad \Delta W=50 \mathrm{~J}}

\mathrm{\Rightarrow \quad \Delta U=84-50=34 \mathrm{~J}}

Posted by

Ritika Kankaria

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