The zinc within a copper-plated penny will dissolve in hydrochloricacid if the copper coating is filed down in several spots (so thatthe hydrochloric acid can get to the zinc). The reaction betweenthe acid and the zinc is as follows:Part A2H (aq)Zn(s) -> H2(g) Zn2(aq)What mass of hydrogen gas was collected?When the zinc in a certain penny dissolves, the total volume ofgas collected over water at 25 °C was 0.957 L at a totalpressure of 758 mm Hg .VASDη ΑΣφVapor Pressure of Water versus TemperatureTemperature Pressure Temperature Pressure(mmHg) (° C)m =g(C)(mmHg)4.58118.2055Request AnswerSubmit6.5460149.69.2165187.510233.71512.7970Return to AssignmentProvide Feedback2017.55289.1752523.78355.18085433.63031.863542.23525.8904055.40633.99545760.071.9710092.650

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Asked Nov 4, 2019
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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 as follows:
Part A
2H (aq)Zn(s) -> H2(g) Zn2(aq)
What mass of hydrogen gas was collected?
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 758 mm Hg .
VASD
η ΑΣφ
Vapor Pressure of Water versus Temperature
Temperature Pressure Temperature Pressure
(mmHg) (° C)
m =
g
(C)
(mmHg)
4.58
118.2
0
55
Request Answer
Submit
6.54
60
149.6
9.21
65
187.5
10
233.7
15
12.79
70
Return to Assignment
Provide Feedback
20
17.55
289.1
75
25
23.78
355.1
80
85
433.6
30
31.86
35
42.23
525.8
90
40
55.40
633.9
95
45
760.0
71.97
100
92.6
50
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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 as follows: Part A 2H (aq)Zn(s) -> H2(g) Zn2(aq) What mass of hydrogen gas was collected? 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 758 mm Hg . VASD η ΑΣφ Vapor Pressure of Water versus Temperature Temperature Pressure Temperature Pressure (mmHg) (° C) m = g (C) (mmHg) 4.58 118.2 0 55 Request Answer Submit 6.54 60 149.6 9.21 65 187.5 10 233.7 15 12.79 70 Return to Assignment Provide Feedback 20 17.55 289.1 75 25 23.78 355.1 80 85 433.6 30 31.86 35 42.23 525.8 90 40 55.40 633.9 95 45 760.0 71.97 100 92.6 50

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Step 1

Given:

Volume = 0.957 L.

Temperature = 25oC = 298 K

Total Pressure = 758 mmHg.

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2H (aq)Zns) -» H2(g)Zn+2(aq)

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Step 2

Calculation for Pressure of H2:

Pressure of H2 = Total pressure – vapour pressure of water

Pressure of H2 = 758 mmHg – 23.78 mmHg = 734.22 mmHg = 0.96608 atm

Step 3

Calculation for number of mo...

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PV nRT PV RT 0.96608 atm X 0.957 L n 0.08206 L. atm/mol. K x 298K n 0.038 mol

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