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\( \mathrm{IP}_{1} \) and \( \mathrm{IP}_{2} \) of \( \mathrm{Mg} \) are 178 and \( 348 \mathrm{~K} \mathrm{cal} \mathrm{mol}^{-1} \). The
\( \mathrm{P} \)
enthalpy required for the reaction \( \mathrm{Mg} \rightarrow \mathrm{Mg}^{2+}+2 \mathrm{e}^{-} \)is:
W
(1) + \( 170 \mathrm{K.cal} \)
(2) +526 K.cal
(3) \( -170 \mathrm{K.cal} \)
(4) \( -526 \mathrm{~K} . \mathrm{cal} \)
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