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\( \mathrm{Na}(\mathrm{s}) \) is converted into \( \mathrm{Na}^{+}(\mathrm{g}) \)
P
\( \mathrm{Na}(\mathrm{s}) \stackrel{\mathrm{q}_{1}}{\longrightarrow} \mathrm{Na}(\mathrm{g}) \)
W
\( \mathrm{Na}(\mathrm{g}) \stackrel{\mathrm{q}_{2}}{\longrightarrow} \mathrm{Na}^{+}(\mathrm{g}) \)
then internal energy change \( \Delta E \) is
(1) \( \mathrm{q}_{1} \)
(2) \( \mathrm{q}_{2} \)
(3) \( \mathrm{q}_{1}+\mathrm{q}_{2} \)
(4) \( q_{1}-q_{2} \)
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