You notice a one-dimensional-thinking snail crawling along one rail of a railroad track. Naturally, you move it to a safer place. But before you do, you observe it as it moves from position i=−82.1 cm to position f=−53.1 cm along the rail, as measured from a nearby joint between two segments of rail. What is the magnitude of the snail's displacement, Δ, in centimeters?

The last one, because there is the same number of atoms (p, cl, h, and o) on both sides of the reaction.

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