$ii)$ $I _{( g )}+ e ^{-} \longrightarrow e _{( z )}^{-} \quad \Delta H _{ if }=-295$
$iii)$ $Cu _{( e )}^{+}+ I _{( e )}^* \rightarrow CuI _{( s )} \quad \Delta H _{ ili }=-446$
$iv)$ $Cu _{( g )}+ I _{( g )} \longrightarrow CuI _{( s )} \quad \Delta H = (?)$
$\therefore \Delta H =\Delta H _{ i }-2 \Delta H _{ii }+2 \Delta H _{ iii }$
$=745+(-295)+(-446)=745-741=4\, kJ$
$\Delta H \,(kJ/mol)$ | |
$\frac 12 A \rightarrow B$ | $+150$ |
$3B \rightarrow 2C + D$ | $-125$ |
$E + A \rightarrow 2D$ | $+350$ |
${H_2}O(g) + C(s) \to CO(g) + {H_2}(g);\,\Delta H = 131\,kJ$$CO(g) + \frac{1}{2}{O_2}(g) \to C{O_2}(g);\Delta H = - 282\,kJ$
${H_2}(g) + \frac{1}{2}{O_2}(g) \to {H_2}O(g);\,\Delta H = - 242\,kJ$
$C(s) + {O_2}(g) \to C{O_2}(g);\,\Delta H = X\,kJ$
$X$ નું મૂલ્ય ......$kJ$
$ PbO$$(yellow)$ $\rightarrow$ $PbO$$(red)$