Tetraphosphorus trisulfide, P 4 S 3 , is used in the manufacture of strike anywhere matches. Elemental

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Tetraphosphorus trisulfide, P4S3, is used in the manufacture of “strike anywhere” matches. Elemental phosphorus and sulfur react directly to form P4S3:

8 P4+3 Sg 8 P4S3


If we have 153 g of S8 and an excess of phosphorus, what mass of P4S3 can be produced by this reaction?

Strategy The heart of any stoichiometry problem is the balanced chemical equation that provides the mole ratio we need. We must convert between masses and the number of moles in order to use this ratio, first for the reactant, S8, and at the end of the problem for the product, P4S3. Molar masses provide the needed conversion factors. The phrase “excess of phosphorus” tells us that we have more than enough P4 to consume 153 g of S8 completely.

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Chemistry For Engineering Students

ISBN: 9780357026991

4th Edition

Authors: Lawrence S. Brown, Tom Holme

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