You had an improving trend from the first midterm to the second, so hopefully you can sustain that. Echoing what others have asked - have you gone to office hours? Not only might the prof be able to give you some helpful guidance, but also, if your grade is borderline, the perceived effort could make a difference to which way it tips. You know you’ve been working hard, but does the prof know it?
Also as others have asked, is this the only class you’ve struggled in? Are you otherwise feeling good about engineering, and this is the one stumbling block, or is this just the tip of a struggle iceberg?
Hang in there; it sounds as if passing is still a possibility; the question is the extent to which strong mastery of this material will (or won’t) be needed for subsequent required classes. Is gen chem 2 required too?