Values of heats of formation for SiO_(2) and MgO are -48.4 and -34.7 k – InterviewSolution

1.	Values of heats of formation for SiO_(2) and MgO are -48.4 and -34.7 kJ respectively. The heat of the reaction 2Mg+SiO_(2)rarr2MgO+Si is
Answer» 21.16 kJ `-21.0 kJ` `-13.62` kJ 13.6 kJ Solution :`DeltaH_(("reaction"))=2DeltaH_(F)^(@)(MGO)=-DeltaH_(f)^(@)(SiO_(2))` `=2(-34.7)-(-48.4)=-21 kJ`.

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