Use the Δ_fH° and Δ_rH° Information Provided to Calculate Δ_fH°

Use the Δ_fH° and Δ_rH° information provided to calculate Δ_fH° for IF: Δ_fH° (kJ mol^-1₎ IF₇(g) + I₂(g) → IF₅(g) + 2IF(g) Δ_rH° = -89 kJ
IF₇(g) -941
IF₅(g) -840

A) 101 kJ mol^-1
B) -146 kJ mol^-1
C) -190. kJ mol^-1
D) -95 kJ mol^-1
E) 24 kJ mol^-1