Stoichiometry: What volume of hydrogen gas in liters was collected at STP?

The purity of a 0.248 gram sample containing Zn is determined by measuring the amount of hydrogen gas formed when the sample reacts with hydrochloric acid. The sample is found to be 91.7% Zn. What volume of hydrogen gas in liters was collected at STP?

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...ore x moles of Zn = 0.248 g
Once you solve this, you get the total number of moles of Zn. Now, you can multiply this number of moles by 91.7% to get the total number of moles Zn.

3) From this ...