A system is given $300$ calories of heat and it does $600$ joules of work. How much does the internal energy of the system change in this process ..... $J$. ($J = 4.18$ joules/cal)
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(a) $J\Delta Q = \Delta U + \Delta W,\;\;\Delta U = J\Delta Q - \Delta W$
$\Delta U = 4.18 \times 300 - 600 = 654\;Joule$
$\Delta U = 4.18 \times 300 - 600 = 654\;Joule$
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