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Exercise 5.71 9 of 10 > Review Constants Periodic Table Part A The zinc within a copper-plated penny will dissolve in hydrochloric acid if the copper coating is filed down in several spots (so that the hydrochloric acid can get to the zinc). The reaction between the acid and the zinc is 2H+ (aq) + Zn(s) + H2(g) + Zn²+ (aq). When the zinc in a certain penny dissolves, the total volume of gas collected over water at 25°C was 0.957 L at a total pressure of 0.995 bar. What mass of hydrogen gas was collected? O AJ no? m= 0.0861 Submit Previous Answers Request Answer X Incorrect; Try Again; One attempt remaining

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Answer 1

5.71) T-25°C = 298.15k m=0.957 L P=0.995 bar = 0.995 atm 1.013 = 0.981989 atm PV en RT 0.957 x 0.981989 0.0821 x 298.15 = 0.03839 mol . mass of H₂ = 2.08 0.03839 = 0.077 g if that does not work, try 0.076 or 0.078 sigo 5.60) magg cm) = 0.555g, P = 752 for missa P= 752 fors = 752 atm = ligmL 20.119 L T = 83°C = 356.15k atm 760 MRT Molar mass PV = 0.555 x 78 0.0821 X 356.15 8760 oill9 X 752 = 138 g/mol (or 140)

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