Use the information in the table to calculate the enthalpy of this reaction.

${\mathrm{C}}_2{\mathrm{H}}_6\left(\mathrm{g}\right)+\frac{7}{2}{\mathrm{O}}_2\left(\mathrm{g}\right)⟶2{\mathrm{CO}}_2\left(\mathrm{g}\right)+3{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

 

Reaction	$∆{\mathrm{H}}_{\mathrm{f}}^{°}$ kJ/mole
2C(s) + 3 H2(g)$\to$C2H6(g)	$-$84.7
2C(s) + O2(g) $\to$CO2(g)	$-$393.5
H2(g) + $\frac{1}{2}$O2(g) $\to$H2O(l)	$-$285.8