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Mass spectroscopy

Exercise 1

Discuss the following mass spectrum:

$\frac{m}{z}$ $=$ $18$ $\Rightarrow$ $H_2O^+$ $\frac{m}{z}$ $=$ $17$ $ \Rightarrow $ $HO^+$ $\frac{m}{z}$ $=16$ $\Rightarrow$ $O^+$

What is this substance?

Water $H_2O$