MCQ
The standard entropy change for the reaction $4 Fe ( s )+3 O _{2}( g ) \rightarrow 2 Fe _{2} O _{3}( s )$ is $-550\, JK ^{-1}$ at $298 \,K$.

[Given : The standard enthalpy change for the reaction is $-165\, kJ\, mol ^{-1}$. The temperature in $K$ at which the reaction attains equilibrium is ... . (Nearest Integer)

  • A
    $30$
  • $300$
  • C
    $210$
  • D
    $670$

Answer

Correct option: B.
$300$
b
$\Delta G =\Delta H - T \Delta S =0$ at equilibrium

$\Rightarrow-165 \times 10^{3}- T \times(-505)=0$

$\Rightarrow T =300\, K$

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