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Question

What volume of hydrogen measured at 27C and 776.7 mm pressure would be obtained by treating 0.65 g of pure zinc with sufficient amount of dilute hydrochloric acid? Aq. tension at 27C is 26.7 mm; At. mass of Zn is 65.


A

200.43 ml

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B

300.43 ml

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C

249.43 ml

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D

244.43 ml

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Solution

The correct option is C

249.43 ml


The reaction of Zn replacing H2 from H2SO4.
Zn + H2SO4
H2SO4 + H2

65g of Zn = 22.4 L of H2 at NTP

0.65g of Zn = 0.224 L of H2 at NTP = 224 ml
Other pressure and temperature are given and volume at that condition is asked.

Thus,use P1V1T1 = P2V2T2
P2=776.7 aqueous tension

760×224273 = 750×V2300

V2 = 249.43 ml


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