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A sample of gas absorbs $4000 \mathrm{~kJ}$ of heat and surrounding does $2000 \mathrm{~J}$ of work on sample. What is the value of $\Delta \mathrm{U}$ ?
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$4002 \mathrm{kJ}$
(A)
$Q=+4000 \mathrm{~kJ}, \mathrm{~W}=+2000 \mathrm{~J}=+2 \mathrm{~kJ}$
$\Delta U=Q+W=4000+2=4002 \mathrm{~kJ}$
$Q=+4000 \mathrm{~kJ}, \mathrm{~W}=+2000 \mathrm{~J}=+2 \mathrm{~kJ}$
$\Delta U=Q+W=4000+2=4002 \mathrm{~kJ}$
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