2. How many liters of O2 are needed to react completely with 475.0 L of H2S at STP? (3 pts.)

2H2S(g) + 3O2 (g) → 2SO2 (g) + 2H2O(g)

The balanced chemical reaction is given as:

2H2S (g) + 3O2 (g) 2SO2 (g) + 2H2O (g)

We are given the volume at STP of H2S to be used for the reaction. This would be the starting point for the calculations. We do as follows:

45.0 L H2S ( 1 mol / 22.4 L) ( 3 mol O2 / 2 mol H2S ) ( 22.4 L / 1 mol ) = 67.5 L O2 needed

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