What is the percent of Zn?

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bonitachica_15

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A 3.00 g sample of a mixture contains copper and zinc. Zinc reacts with HCl according to the equation show below, but copper does not react with HCl. What is the percentage of Zn in the sample if 0.927 L of hydrogen gas is released at 0.974 atm and 293 K. (Atomic mass: Zn = 65.39, H = 1.008, Cl = 35.45, O = 16.00; R = 0.0821 L atm mol-1 K-1).

Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(g)

85.3%
79.2%
77.1%
81.8%
None of the above are correct.
 
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