પ્રકિયા $2{C_{\left( {graphite} \right)}} + 2{H_{2\left( g \right)}} \to {C_2}{H_{4\left( g \right)}}$ માટે એન્થાલ્પી ફેરફાર......$kJ$ ગણો.

${C_{\left( {graphite} \right)}} + {O_{2\left( g \right)}} \to C{O_{2\left( g \right)}}\,;\,\Delta H = -393.5\,kJ$

${C_2}{H_{4\left( g \right)}} + 3{O_{2\left( g \right)}} \to 2C{O_{2\left( g \right)}} + 2{H_2}{O_{\left( l \right)}}\,;\,\Delta H = - 1410.9\,kJ$

${H_{2\left( g \right)}} + 1/2{O_{2\left( g \right)}} \to {H_2}{O_{\left( l \right)}}\,;\,\Delta H = - 285.8\,kJ$

Question

પ્રકિયા $2{C_{\left( {graphite} \right)}} + 2{H_{2\left( g \right)}} \to {C_2}{H_{4\left( g \right)}}$ માટે એન્થાલ્પી ફેરફાર......$kJ$ ગણો.

${C_{\left( {graphite} \right)}} + {O_{2\left( g \right)}} \to C{O_{2\left( g \right)}}\,;\,\Delta H = -393.5\,kJ$

${C_2}{H_{4\left( g \right)}} + 3{O_{2\left( g \right)}} \to 2C{O_{2\left( g \right)}} + 2{H_2}{O_{\left( l \right)}}\,;\,\Delta H = - 1410.9\,kJ$

${H_{2\left( g \right)}} + 1/2{O_{2\left( g \right)}} \to {H_2}{O_{\left( l \right)}}\,;\,\Delta H = - 285.8\,kJ$

Medium

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Solution

b
$i)$ $C + O _2 \longrightarrow CO _2 \quad \Delta H _i=-393.5$

$ii)$ $C _2 H _4+3 O _2 \longrightarrow 2 CO _2+2 H _2 O \quad \Delta H _{ ii }=-1410.9$

$iii)$ $H _2+\frac{1}{2} O _2 \longrightarrow H _2 O \quad \Delta I _{ iii }=-25.8$

$iv)$ $2 C +2 H _2 \longrightarrow C _2 H _4 \Delta H =(?)$

$iv)$ $=2( i )-( ii )+2 (iii)$

$\therefore \Delta H =2 \Delta H _{ i }-2 \Delta H _{ ii }+2 \Delta H _{ iii }$

$=2(-393.5)-(-1410.9)+2(-285.8)$

$=-787+1410.9-571.6$

$=1410.9-1358.6$

$=52.3\, kJ$

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