\( 20 \mathrm{~g} \) of \( \mathrm{N}_{2} \) at \( 300 \mathrm{~K} \) is compressed reversibly a....

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\( 20 \mathrm{~g} \) of \( \mathrm{N}_{2} \) at \( 300 \mathrm{~K} \) is compressed reversibly and
\( \mathrm{P} \)
adiabatically from \( 20 \mathrm{dm}^{3} \) to \( 10 \mathrm{dm}^{3} \).
W
The internal energy change of the system is:
(1) \( 1 \mathrm{~kJ} \)
(2) \( 2 \mathrm{~kJ} \)
(3) \( 1.4 \mathrm{~kJ} \)
(4) \( 7 \mathrm{~kJ} \)


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