Reverse the equation, you flip the sign of ΔH also. Multiply the equation, you multiply the ΔH by same number. It is like adjusting a blouse pattern — if you turn the cloth, the stitching direction changes, no?
In my coaching class, they make it sound so sure, like a perfect straight stitch. But when I try, sometimes my ΔH total is still wrong, like a sleeve cut too short. The problem is not the rule; the problem is my tired mind, counting carbons like buttons at midnight after helping Appa with his sewing.
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