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To determine the molar mass for any compound, you multiply the molar mass of each element (Atomic Mass in grams) times its subscript, which represents the number of atoms of that element. Then add the result for each element.

Molar Mass of P4S3

(4 atoms x 30.974g/mol P) + (3 atoms x 32.06g/mol S) =

123.90g/mol P + 96.18g/mol S = 220.08g/mol P4S3

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