Reaction $1$ NH$4$Cl $($s$)->$ NH$4$Cl$($aq$)$ Delta H$=17\mathrm{.}33$KJ

Reaction $2$ NH$3($aq$)+$ HCl $($aq$)->$ NH$4$Cl $($aq $)$Delta H$=-78\mathrm{.}835$KJ

Reaction $31/2$ N$2($g$)+3/2$ H$2($g$)->$ NH$3($g$)\backslash$Delta Ho $=-45\mathrm{.}9$ kJ

Reaction $4$ NH$3($g$)->$ NH$3($aq$)\backslash$Delta Ho $=-30\mathrm{.}5$ kJ

Reaction $51/2$ H$2($g$)+1/2$ Cl$2($g$)->$ HCl $($g$)\backslash$Delta Ho $=-92\mathrm{.}3$kJ

Reaction $6$ HCl $($g$)->$ HCl$($aq$)\backslash$Delta Ho $=-74\mathrm{.}8$ kJ

$----------------------------------------------------------$

Reaction $71/2$ N$2($g$)+2$ H$2($g$)+1/2$ Cl$2($g$)->$ NH$4$Cl $($s$)$ Delta H $=?$

Can some one help me determine the delta H of the $7$ equation by using Hess's Law? but the question asks me to manipulate $6$ equations above too