Problem- The purity of a sample containing zinc and weighing 0.348 g is determined by measuring the amount of hydrogen formed when the sample reacts with an excess of hydrochloric acid. The determination shows the sample to be 84.0% zinc. What amount of hydrogen (measured at STP) was obtained?
2.92 × 10-1 L
1.45 × 10-1 g
5.32 × 10-3 mole
2.69 × 1021 molecules
2.69 × 1021 atoms
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