નીચેની માહિતી પરથી ઇથિલિનની સર્જન એન્થાલ્પી.......$kJ\,mo{l^{ - 1}}$ ગણો.

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

${H_{2\left( g \right)}} + 1/2{O_{2\left( g \right)}} \to {H_2}{O_{\left( l \right)}}\,;\,\Delta H = - 286.2\,kJ$

${C_2}{H_{4\left( g \right)}} + 3{O_{2\left( g \right)}} \to 2C{O_{2\left( g \right)}} + 2{H_2}{O_{\left( l \right)}}\,;\,\Delta H = - 1410.8\,kJ$

Question

નીચેની માહિતી પરથી ઇથિલિનની સર્જન એન્થાલ્પી.......$kJ\,mo{l^{ - 1}}$ ગણો.

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

${H_{2\left( g \right)}} + 1/2{O_{2\left( g \right)}} \to {H_2}{O_{\left( l \right)}}\,;\,\Delta H = - 286.2\,kJ$

${C_2}{H_{4\left( g \right)}} + 3{O_{2\left( g \right)}} \to 2C{O_{2\left( g \right)}} + 2{H_2}{O_{\left( l \right)}}\,;\,\Delta H = - 1410.8\,kJ$

Medium

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Solution

c
$i)$ $C + O _2 \longrightarrow CO _2 \quad \Delta H _{ i }=-393.5$

$ii)$ $H _2+\frac{1}{2} O _2 \rightarrow H _2 O \quad \Delta H _{i i }=-286.2$

$iii)$ $C _2 H _4+3 O _2 \longrightarrow 2 CO _2+2 H _2 O \quad \Delta H _{\text {iil }}=-1410.8$

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

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

$\therefore \Delta H =2 \Delta H _1+2 \Delta H _{ii}-2 \Delta H _{\text {iii}}$

$=2(-393.5)-2(-286.2)-(-1410.8)$

$=-787+572.4+1410.8$

$=-1359.4+1410.8$

$=+51.4\, kJ\, mol^{-1}$

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