$C{H_3} - \mathop {\mathop {CH - }\limits_{|\,\,\,\,\,\,\,} }\limits_{C{H_3}\,} C{H_2} - C{H_2} - Cl$
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$NH_3(g) + O_2(g) \rightarrow NO(g) + H_2O(l)$
$NO(g) + O_2(g) \rightarrow NO_2(g)$
To obtain maximum mass of $NO_2$ from a given mass of mixture $NH_3$ and $O_2$, the ratio of mass of $NH_3$ to $O_2$ should be -
$Fe_2O_{3(s)} + 3CO_{(g)} \rightarrow 2Fe_{(s)} + 3CO_{2(g)};$ $\Delta H = - 26.8\, kJ$
$FeO_{(s)} + CO_{(g)} \rightarrow Fe_{(s)} + CO_{2(g)} \, ;$ $\Delta H = - 16.5\, kJ$
The value of $\Delta H$ for the following reaction
$Fe_2O_{3(s)} + CO_{(g)} \rightarrow 2FeO_{(s)} + CO_{2(g)}$ is ............. $\mathrm{kJ}$
$PH _{3}, B _{2} H _{6}, CCl _{4}, NH _{3}, LiH$ and $BCl _{3}$ is ..... .