Question 8.5: Predict the shape of a methanal, H2CO, molecule, better know......

General Chemistry [1096620]

Predict the shape of a methanal, $H_{2}CO$ , molecule, better known by its common name, formaldehyde.

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The Lewis formula for a $H_{2}CO$ molecule is

\begin{matrix} H_{_{\diagdown }} \\ \hspace{45 pt} C=O^{^{.}.}_{_{.}.} \\ H^{^{\diagup }}\end{matrix}

We treat the double bond as one group of electrons and classify $H_{2}CO$ as an $AX_{3}$ molecule. We predict (correctly) that $H_{2}CO$ is a trigonal planar molecule; in other words, all four atoms lie in a single plane. Figure 8.14 shows a space-filling model of a formaldehyde molecule.

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