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chemistry

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having some trouble with this.

carbon disulfide is a covalent molecule that has a melting temperature of -110.8 C°. at room temperature 25C° and pressure 1 atmosphere carbon disulfide is a liquid. under the same conditions aluminium sulphide, an ionic compound , is a solid with a melting temperature of 1110 C° write the chemical formulas of these two substances:

so what i did is this:
Cs2+ Al2S3

but there is no chemical formula right? or I'm ai wrong?

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