In a thermodynamic process pressure of a fixed mass of a gas is changed in such a manner that the gas releases $30$ joules of heat and $10$ joules of work was done on the gas. If the initial internal energy of the gas was $30$ joules, then the final internal energy will be ........ $J$
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(c) $\Delta Q = \Delta U + \Delta W$$ = ({U_f} - {U_i}) + \Delta W$
==> $ - 30 = ({U_f} - 30) - 10$ ==> ${U_f} = 10\,J$
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