Answer to Question #83873 in General Chemistry for Logan

Question

The combustion reaction for Compound X is
given.
X(s) + 6 O2(g) → 6 CO2(g) + 6 H2O(ℓ)
∆H◦
for this reaction is equal to −3840
kJ/mol. ∆H◦
f
for CO2(g) is −393.5 kJ/mol
and ∆H◦
f
for H2O(ℓ) is −285.8 kJ/mol.
Calculate ∆H
0
f
for Compound X.
Answer in units of kJ/mol.