MCQ
For complete combustion of ethene.

$C _2 H _4( g )+3 O _2( g ) \rightarrow 2 CO _2( g )+2 H _2 O ( l )$ the amount of heat produced as measured in bomb calorimeter is $1406\,kJ\,mol { }^{-1}$ at $300\,K$. The minimum value of $T \Delta S$ needed to reach equilibrium is $(-).......\,kJ$. (Nearest integer) Given : $R =8.3\,JK ^{-1} mol ^{-1}$

  • $1411$
  • B
    $1412$
  • C
    $1413$
  • D
    $1414$

Answer

Correct option: A.
$1411$
a
$C _2 H _{4( g )}+3 O _{2( g )} \longrightarrow 2 CO _{2( g )}+2 H _2 O_{(l)}$

$\Delta U =-1406\,KJ\,mol ^{-1}, T =300\,K$

$\Delta H =\Delta U +\Delta n _{ g } RT$

$\Delta H =-1406+(-2) \times 8.3 \times 300=-1406-4.98$

$=-1410.98\,KJ\,mol ^{-1} \approx-1411$

$\Delta H = T \Delta S =-1411\,KJ\,mol ^{-1}$

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