Calculate the standard enthalpy variation of the following reaction consulting the → Table of formation enthalpies : $SiCl_4(l)$ $+$ $2H_2O(l)$ $\longrightarrow$ $SiO_2(s)$ $+$ $4HCl(aq)$
$\Delta H^o$ $ =$ $(\Delta H_f(SiO_2(s))$ $+$ $4\Delta H_f(HCl(aq)))$ $-$ $(\Delta H_f(SiCl_4(l))$ $+$ $2\Delta H_f(H_2O(l)))$ $=$ $-320.92 \;kJ$