1. Tardigrade
  2. Question
  3. Chemistry
  4. Standard heat of formation (Δ H fo) of different oxides of third period are given below Oxide Δ H fo( kJ m o l -1) Na2O -416 MgO -602 Al2O3 -1676 SiO2 -911 P4O10 -2984 SO3 -395 Most stable oxide is

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Q. Standard heat of formation $\left(\Delta H _{f}^{o}\right)$ of different oxides of third period are given below
Oxide $\Delta H _{f}^{o}\left( kJ\, m o l ^{-1}\right)$
$Na_2O$ -416
MgO -602
$Al_2O_3$ -1676
$SiO_2$ -911
$P_4O_{10}$ -2984
$SO_3$ -395

Most stable oxide is

Classification of Elements and Periodicity in Properties

Solution:

$MgO$ is most stable

Stability is based on the $\Delta H _{f}^{o}$ value per oxygen atom. Most negative value of $\Delta H _{f}^{o}$ per oxygen atom indicates most stable oxide.