Question

express your answer as a chemical formula.
hcn
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hydrocyanic acid is hcn.
part c
chlorous acid
express your answer as a chemical formula.
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Explanation:

Step1: Recall chlorous acid structure

Chlorous acid has chlorite ion ($\ce{ClO2^-}$) and $\ce{H^+}$.

Step2: Combine ions

To form neutral formula, $\ce{H^+}$ and $\ce{ClO2^-}$ combine as $\ce{HClO2}$.

Answer:

$\ce{HClO2}$