Hess’s Cycle Question 6

The ΔH_c of silane gives SiO₂ and H₂O and releases -1507 kJ mol^-1.

The ΔH_c of silicon releases -911 kJ mol^-1.

The ΔH_c of hydrogen releases -286 kJ mol^-1.

Using the above information, find the ΔH_fof SiH₄.

$clockwise = anticlockwise$

${\color{Red} x}+{\color{Magenta} (-1507)} = {\color{Blue} 2(-286)+(-911)}$

$x=24kJ$