For combustion of one mole of magnesium in an open container at \( 300 \mathrm{~K} \) and 1 bar ...

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For combustion of one mole of magnesium in an open container at \( 300 \mathrm{~K} \) and 1 bar pressure, \( \Delta_{\mathrm{C}} \mathrm{H}^{\ominus}=-601.70 \mathrm{~kJ} \) \( \mathrm{mol}^{-1} \), the magnitude of change in internal energy for the reaction is \( \mathrm{kJ} \).
(Given: \( \mathrm{R}=8.3 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1} \) )
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