Partial pressure of H2 = 755mmHg - 23.8mm Hg = 731.2 mm Hg = 731.2/760 atm = 0.962 atm
Number of moles of H2 = PV/RT = 0.962atm× 8.44L/(0.0821atm-L/K.mol × 298.15K) = 0.3317 mol
Number of moles of Zn reacted = number of moles of H2 formed
Number of moles of Zn recated = 0.33 mol
Or
= 0.332 mol ( three significant figures)
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