Final answer:
Assuming a linear structure similar to OCS for SCS with double bonds to each carbon, SCS would contain one sigma bond for each sulfur-carbon bond and one sigma bond within the carbon-carbon bond, totaling three sigma bonds.
Step-by-step explanation:
To determine the number of sigma bonds in a molecule with the formula SCS, we consider the types of covalent bonds that can exist. In general, single bonds are always sigma bonds. For double and triple bonds, they consist of one sigma bond and the remainder being pi bonds. The SCS molecule lacks a detailed structural formula in the question, but if we assume it is similar to OCS (carbon disulfide), which is linear with double bonds, it would have a sigma bond for each C-S bond and one sigma bond within the C=C bond.
If SCS is indeed referring to a molecule with a formula of SC2, where S is bonded with a double bond to each carbon atom, then each double bond consists of one sigma and one pi bond. Therefore, there would be one sigma bond for each of the bonds between sulfur and carbon, totaling two sigma bonds, plus an additional sigma bond for the C=C bond.