J.R. S. answered 10/31/21
Ph.D. University Professor with 10+ years Tutoring Experience
More info is needed.
We need the initial temperature of the solid octane, along with the ∆Hfusion, specific heat for liquid octane, specific heat for solid octane if starting temp is below melting point,and ∆Hvap if the boiling point is greater than 118.8ºC.