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Identify the number of molecular solids among the compounds below.GaSb; Cu; FeO3; CaO2; glass; sapphire; rust; methane; benzene; Teflon.

Identify the number of molecular solids among the compounds below.
GaSb; Cu; FeO₃; CaO₂; glass; sapphire; rust; methane; benzene; Teflon.